diff --git a/Jenkinsfile b/Jenkinsfile
index 26be1f2a2ab..5747b3a12b9 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -243,12 +243,7 @@ pipeline {
         }
 
         stage('Full Unit Tests') {
-            agent {
-                docker {
-                    image 'stanorg/ci:gpu'
-                    label 'linux'
-                }
-            }
+            agent {  label 'gg-linux'  }
             when {
                 expression {
                     !skipRemainingStages
@@ -257,17 +252,17 @@ pipeline {
             steps {
                 unstash 'MathSetup'
                 // Set Stan local compiler flags to use the new TBB interface
-                sh """
-                    export TBB_INC=\$(pwd)/lib/tbb_2020.3/include
-                    export TBB_LIB=\$(pwd)/lib/tbb
-                    echo TBB_INTERFACE_NEW=true > make/local
-                """
+                // sh """
+                //     export TBB_INC=\$(pwd)/lib/tbb_2020.3/include
+                //     export TBB_LIB=\$(pwd)/lib/tbb
+                //     echo TBB_INTERFACE_NEW=true > make/local
+                // """
 	            sh "echo CXXFLAGS += -fsanitize=address >> make/local"
                 script {
                     if (isUnix()) {
-                        runTests("test/unit/math/test_ad_test.cpp", false)
+                        runTests("test/unit", false)
                     } else {
-                        runTestsWin("test/unit/math/test_ad_test.cpp", true)
+                        runTestsWin("test/unit", true)
                     }
                 }
             }
diff --git a/stan/math/prim/fun/to_matrix.hpp b/stan/math/prim/fun/to_matrix.hpp
index 8f97574bc01..61cb1182eba 100644
--- a/stan/math/prim/fun/to_matrix.hpp
+++ b/stan/math/prim/fun/to_matrix.hpp
@@ -11,20 +11,35 @@ namespace math {
 
 /**
  * Returns a matrix with dynamic dimensions constructed from an
- * Eigen matrix which is either a row vector, column vector,
- * or matrix.
- * The runtime dimensions will be the same as the input.
+ * Eigen matrix.
  *
  * @tparam EigMat type of the matrix
  *
  * @param x matrix
  * @return the matrix representation of the input
  */
-template <typename EigMat, require_eigen_t<EigMat>* = nullptr>
+template <typename EigMat, require_eigen_dense_dynamic_t<EigMat>* = nullptr>
 inline EigMat to_matrix(EigMat&& x) {
   return std::forward<EigMat>(x);
 }
 
+/**
+ * Returns a matrix with dynamic dimensions constructed from an
+ * Eigen row or column vector.
+ * The runtime dimensions will be the same as the input.
+ *
+ * @tparam EigMat type of the vector/row vector
+ *
+ * @param x input vector/row vector
+ * @return the matrix representation of the input
+ */
+template <typename EigVec, require_eigen_vector_t<EigVec>* = nullptr>
+inline auto to_matrix(EigVec&& matrix) {
+  return Eigen::Matrix<
+          value_type_t<EigVec>,
+          Eigen::Dynamic, Eigen::Dynamic>(std::forward<EigVec>(matrix));
+}
+
 /**
  * Returns a matrix representation of a standard vector of Eigen
  * row vectors with the same dimensions and indexing order.