diff --git a/foamlib/_files/_io.py b/foamlib/_files/_io.py
index 541678a..b33d1ef 100644
--- a/foamlib/_files/_io.py
+++ b/foamlib/_files/_io.py
@@ -43,13 +43,15 @@ def __exit__(
         self.__defer_io -= 1
         if self.__defer_io == 0:
             assert self.__parsed is not None
-            if self.__parsed.modified or self.__missing:
+            if self.__parsed.modified:
                 contents = self.__parsed.contents
 
                 if self.path.suffix == ".gz":
                     contents = gzip.compress(contents)
 
                 self.path.write_bytes(contents)
+                self.__parsed.modified = False
+                self.__missing = False
 
     def _get_parsed(self, *, missing_ok: bool = False) -> Parsed:
         if not self.__defer_io:
@@ -69,7 +71,7 @@ def _get_parsed(self, *, missing_ok: bool = False) -> Parsed:
         assert self.__parsed is not None
         assert self.__missing is not None
 
-        if self.__missing and not missing_ok:
+        if self.__missing and not self.__parsed.modified and not missing_ok:
             raise FileNotFoundError(self.path)
 
         return self.__parsed
diff --git a/foamlib/_files/_parsing.py b/foamlib/_files/_parsing.py
index 873a988..f0a0056 100644
--- a/foamlib/_files/_parsing.py
+++ b/foamlib/_files/_parsing.py
@@ -1,5 +1,4 @@
 import array
-import contextlib
 import sys
 from typing import Tuple, Union, cast
 
@@ -273,22 +272,24 @@ def put(
     ) -> None:
         assert not isinstance(data, Mapping)
 
-        with contextlib.suppress(KeyError):
-            del self[keywords]
-
         start, end = self.entry_location(keywords, missing_ok=True)
-        diff = len(content) - (end - start)
 
-        self._parsed[keywords] = (start, data, end + diff)
+        diff = len(content) - (end - start)
         for k, (s, d, e) in self._parsed.items():
             if s > end:
                 self._parsed[k] = (s + diff, d, e + diff)
             elif e > start:
                 self._parsed[k] = (s, d, e + diff)
 
+        self._parsed[keywords] = (start, data, end + diff)
+
         self.contents = self.contents[:start] + content + self.contents[end:]
         self.modified = True
 
+        for k in list(self._parsed):
+            if keywords != k and keywords == k[: len(keywords)]:
+                del self._parsed[k]
+
     def __delitem__(self, keywords: Union[str, Tuple[str, ...]]) -> None:
         if isinstance(keywords, str):
             keywords = (keywords,)
@@ -327,8 +328,9 @@ def entry_location(
         except KeyError:
             if missing_ok:
                 if len(keywords) > 1:
-                    _, _, end = self._parsed[keywords[:-1]]
-                    end -= 1
+                    assert self[keywords[:-1]] is ...
+                    start, end = self.entry_location(keywords[:-1])
+                    end = self.contents.rindex(b"}", start, end)
                 else:
                     end = len(self.contents)