diff --git a/parsley/shared/src/main/scala/parsley/errors/combinator.scala b/parsley/shared/src/main/scala/parsley/errors/combinator.scala
index 1dfd725b4..1357299a8 100644
--- a/parsley/shared/src/main/scala/parsley/errors/combinator.scala
+++ b/parsley/shared/src/main/scala/parsley/errors/combinator.scala
@@ -112,7 +112,7 @@ object combinator {
       * @since 3.1.0
       * @group adj
       */
-    def amend[A](p: Parsley[A]): Parsley[A] = new Parsley(new frontend.ErrorAmend(p.internal))
+    def amend[A](p: Parsley[A]): Parsley[A] = new Parsley(new frontend.ErrorAmend(p.internal, partial = false))
 
     /** This combinator prevents the action of any enclosing `amend` on the errors generated by the given
       * parser.
@@ -144,6 +144,8 @@ object combinator {
     // TODO: Documentation and testing ahead of future release
     private [parsley] def dislodge[A](p: Parsley[A]): Parsley[A] = new Parsley(new frontend.ErrorDislodge(p.internal))
     private [parsley] def amendThenDislodge[A](p: Parsley[A]): Parsley[A] = dislodge(amend(p))
+    private [parsley] def partialAmend[A](p: Parsley[A]): Parsley[A] = new Parsley(new frontend.ErrorAmend(p.internal, partial = true))
+    private [parsley] def partialAmendThenDislodge[A](p: Parsley[A]): Parsley[A] = dislodge(partialAmend(p))
 
     /** This combinator marks any errors within the given parser as being ''lexical errors''.
       *
diff --git a/parsley/shared/src/main/scala/parsley/internal/deepembedding/backend/ErrorEmbedding.scala b/parsley/shared/src/main/scala/parsley/internal/deepembedding/backend/ErrorEmbedding.scala
index fca356166..9ec2deaf1 100644
--- a/parsley/shared/src/main/scala/parsley/internal/deepembedding/backend/ErrorEmbedding.scala
+++ b/parsley/shared/src/main/scala/parsley/internal/deepembedding/backend/ErrorEmbedding.scala
@@ -36,10 +36,10 @@ private [deepembedding] final class ErrorExplain[A](val p: StrictParsley[A], rea
     // $COVERAGE-ON$
 }
 
-private [deepembedding] final class ErrorAmend[A](val p: StrictParsley[A]) extends ScopedUnaryWithState[A, A](false) {
+private [deepembedding] final class ErrorAmend[A](val p: StrictParsley[A], partial: Boolean) extends ScopedUnaryWithState[A, A](false) {
     override val instr: instructions.Instr = instructions.PopHandlerAndState
     override def instrNeedsLabel: Boolean = false
-    override def handlerLabel(state: CodeGenState): Int  = state.getLabel(instructions.AmendAndFail)
+    override def handlerLabel(state: CodeGenState): Int  = state.getLabel(instructions.AmendAndFail(partial))
     // $COVERAGE-OFF$
     final override def pretty(p: String): String = s"amend($p)"
     // $COVERAGE-ON$
diff --git a/parsley/shared/src/main/scala/parsley/internal/deepembedding/frontend/ErrorEmbedding.scala b/parsley/shared/src/main/scala/parsley/internal/deepembedding/frontend/ErrorEmbedding.scala
index 2b1cdc184..517c10369 100644
--- a/parsley/shared/src/main/scala/parsley/internal/deepembedding/frontend/ErrorEmbedding.scala
+++ b/parsley/shared/src/main/scala/parsley/internal/deepembedding/frontend/ErrorEmbedding.scala
@@ -12,8 +12,8 @@ private [parsley] final class ErrorExplain[A](p: LazyParsley[A], reason: String)
     override def make(p: StrictParsley[A]): StrictParsley[A] = new backend.ErrorExplain(p, reason)
 }
 
-private [parsley] final class ErrorAmend[A](p: LazyParsley[A]) extends Unary[A, A](p) {
-    override def make(p: StrictParsley[A]): StrictParsley[A] = new backend.ErrorAmend(p)
+private [parsley] final class ErrorAmend[A](p: LazyParsley[A], partial: Boolean) extends Unary[A, A](p) {
+    override def make(p: StrictParsley[A]): StrictParsley[A] = new backend.ErrorAmend(p, partial)
 }
 private [parsley] final class ErrorEntrench[A](p: LazyParsley[A]) extends Unary[A, A](p) {
     override def make(p: StrictParsley[A]): StrictParsley[A] = new backend.ErrorEntrench(p)
diff --git a/parsley/shared/src/main/scala/parsley/internal/machine/instructions/ErrorInstrs.scala b/parsley/shared/src/main/scala/parsley/internal/machine/instructions/ErrorInstrs.scala
index f9d119dde..bae8c05ae 100644
--- a/parsley/shared/src/main/scala/parsley/internal/machine/instructions/ErrorInstrs.scala
+++ b/parsley/shared/src/main/scala/parsley/internal/machine/instructions/ErrorInstrs.scala
@@ -86,10 +86,10 @@ private [internal] class ApplyReasonAndFail(reason: String) extends Instr {
     // $COVERAGE-ON$
 }
 
-private [internal] object AmendAndFail extends Instr {
+private [internal] class AmendAndFail private (partial: Boolean) extends Instr {
     override def apply(ctx: Context): Unit = {
         ensureHandlerInstruction(ctx)
-        ctx.errs.error = ctx.errs.error.amend(ctx.states.offset, ctx.states.line, ctx.states.col)
+        ctx.errs.error = ctx.errs.error.amend(if (partial) ctx.offset else ctx.states.offset, ctx.states.line, ctx.states.col)
         ctx.states = ctx.states.tail
         ctx.fail()
     }
@@ -98,6 +98,11 @@ private [internal] object AmendAndFail extends Instr {
     override def toString: String = "AmendAndFail"
     // $COVERAGE-ON$
 }
+private [internal] object AmendAndFail {
+    private [this] val partial = new AmendAndFail(partial = true)
+    private [this] val full = new AmendAndFail(partial = false)
+    def apply(partial: Boolean): AmendAndFail = if (partial) this.partial else this.full
+}
 
 private [internal] object EntrenchAndFail extends Instr {
     override def apply(ctx: Context): Unit = {
diff --git a/parsley/shared/src/main/scala/parsley/token/errors/ConfigImplTyped.scala b/parsley/shared/src/main/scala/parsley/token/errors/ConfigImplTyped.scala
index f2dfebf67..01a7aaeef 100644
--- a/parsley/shared/src/main/scala/parsley/token/errors/ConfigImplTyped.scala
+++ b/parsley/shared/src/main/scala/parsley/token/errors/ConfigImplTyped.scala
@@ -9,6 +9,14 @@ private [parsley] object FilterOps {
         if (full) combinator.amendThenDislodge(p)
         else p
     }
+    def amendThenDislodgeOrPartial[A](full: Boolean)(p: Parsley[A]): Parsley[A] = {
+        if (full) combinator.amendThenDislodge(p)
+        else combinator.partialAmendThenDislodge(p)
+    }
+    def entrench[A](full: Boolean)(p: Parsley[A]): Parsley[A] = {
+        if (full) combinator.entrench(p)
+        else p
+    }
 }
 
 /** This trait, and its subclasses, can be used to configure how filters should be used within the `Lexer`.
@@ -46,12 +54,12 @@ abstract class SpecialisedMessage[A](fullAmend: Boolean) extends SpecialisedFilt
     def message(x: A): Seq[String]
 
     private [parsley] final override def filter(p: Parsley[A])(f: A => Boolean) = FilterOps.amendThenDislodge(fullAmend) {
-        p.guardAgainst {
+        FilterOps.entrench(fullAmend)(p).guardAgainst {
             case x if !f(x) => message(x)
         }
     }
     private [parsley] final override def collect[B](p: Parsley[A])(f: PartialFunction[A, B]) =  FilterOps.amendThenDislodge(fullAmend) {
-        p.collectMsg(message(_))(f)
+        FilterOps.entrench(fullAmend)(p).collectMsg(message(_))(f)
     }
     private [parsley] final override def injectLeft[B] = new SpecialisedMessage[Either[A, B]](fullAmend) {
         def message(xy: Either[A, B]) = {
@@ -80,7 +88,7 @@ abstract class Unexpected[A](fullAmend: Boolean) extends VanillaFilterConfig[A]
     def unexpected(x: A): String
 
     private [parsley] final override def filter(p: Parsley[A])(f: A => Boolean) = FilterOps.amendThenDislodge(fullAmend) {
-        p.unexpectedWhen {
+        FilterOps.entrench(fullAmend)(p).unexpectedWhen {
             case x if !f(x) => unexpected(x)
         }
     }
@@ -111,7 +119,7 @@ abstract class Because[A](fullAmend: Boolean) extends VanillaFilterConfig[A] { s
     def reason(x: A): String
 
     private [parsley] final override def filter(p: Parsley[A])(f: A => Boolean) = FilterOps.amendThenDislodge(fullAmend) {
-        p.filterOut {
+        FilterOps.entrench(fullAmend)(p).filterOut {
             case x if !f(x) => reason(x)
         }
     }
@@ -146,12 +154,11 @@ abstract class UnexpectedBecause[A](fullAmend: Boolean) extends VanillaFilterCon
       */
     def reason(x: A): String
 
-    private [parsley] final override def filter(p: Parsley[A])(f: A => Boolean) = FilterOps.amendThenDislodge(fullAmend) {
-        combinator.amendThenDislodge {
-            position.internalOffsetSpan(combinator.entrench(p)).flatMap { case (os, x, oe) =>
-                if (f(x)) combinator.unexpected(oe - os, this.unexpected(x)).explain(reason(x))
-                else pure(x)
-            }
+    // TODO: factor this combinator out with the "Great Move" in 4.2
+    private [parsley] final override def filter(p: Parsley[A])(f: A => Boolean) = FilterOps.amendThenDislodgeOrPartial(fullAmend) {
+        position.internalOffsetSpan(combinator.entrench(p)).flatMap { case (os, x, oe) =>
+            if (f(x)) combinator.unexpected(oe - os, this.unexpected(x)).explain(reason(x))
+            else pure(x)
         }
     }
     private [parsley] final override def injectLeft[B] = new UnexpectedBecause[Either[A, B]](fullAmend) {
diff --git a/parsley/shared/src/main/scala/parsley/token/errors/VerifiedAndPreventativeErrors.scala b/parsley/shared/src/main/scala/parsley/token/errors/VerifiedAndPreventativeErrors.scala
index 4b293bfa5..d05d9abf9 100644
--- a/parsley/shared/src/main/scala/parsley/token/errors/VerifiedAndPreventativeErrors.scala
+++ b/parsley/shared/src/main/scala/parsley/token/errors/VerifiedAndPreventativeErrors.scala
@@ -23,8 +23,9 @@ object UnexpectedZeroDot {
     def apply(unexpected: String): PreventDotIsZeroConfig = new UnexpectedZeroDot(unexpected)
 }
 
+// TODO: factor this combinator out with the "Great Move" in 4.2
 private final class UnexpectedZeroDotWithReason private (unexpected: String, reason: String) extends PreventDotIsZeroConfig {
-    private [token] override def apply(p: Parsley[Boolean]): Parsley[Boolean] = combinator.amendThenDislodge {
+    private [token] override def apply(p: Parsley[Boolean]): Parsley[Boolean] = combinator.partialAmendThenDislodge {
         position.internalOffsetSpan(combinator.entrench(p)).flatMap { case (os, x, oe) =>
             if (x) combinator.unexpected(oe - os, unexpected).explain(reason)
             else pure(x)