diff --git a/src/OpenFOAM/containers/Lists/DynamicList/DynamicList.H b/src/OpenFOAM/containers/Lists/DynamicList/DynamicList.H
index 719eabff57..c85d22ae2c 100644
--- a/src/OpenFOAM/containers/Lists/DynamicList/DynamicList.H
+++ b/src/OpenFOAM/containers/Lists/DynamicList/DynamicList.H
@@ -447,7 +447,7 @@ public:
         }
 
         //- Same as push_uniq()
-        FOAM_DEPRECATED_STRICT(2022-10, "push_uniq()")
+        FOAM_DEPRECATED_FOR(2022-10, "push_uniq()")
         label appendUniq(const T& val) { return this->push_uniq(val); }
 };
 
diff --git a/src/OpenFOAM/containers/Lists/List/List.C b/src/OpenFOAM/containers/Lists/List/List.C
index 9d34db4381..6249cedb7b 100644
--- a/src/OpenFOAM/containers/Lists/List/List.C
+++ b/src/OpenFOAM/containers/Lists/List/List.C
@@ -486,35 +486,4 @@ void Foam::sortedOrder
 }
 
 
-// * * * * * * * * * * * * * * * Housekeeping  * * * * * * * * * * * * * * * //
-
-#include "SLList.H"
-
-template<class T>
-Foam::List<T>::List(const SLList<T>& list)
-:
-    List<T>(list.begin(), list.end(), list.size())
-{}
-
-
-template<class T>
-void Foam::List<T>::operator=(const SLList<T>& list)
-{
-    const label len = list.size();
-
-    reAlloc(len);
-
-    // Cannot use std::copy algorithm
-    // - SLList doesn't define iterator category
-
-    T* iter = this->begin();
-
-    for (const T& val : list)
-    {
-        *iter = val;
-        ++iter;
-    }
-}
-
-
 // ************************************************************************* //
diff --git a/src/OpenFOAM/containers/Lists/List/List.H b/src/OpenFOAM/containers/Lists/List/List.H
index 76e7c7d94d..d333d8001f 100644
--- a/src/OpenFOAM/containers/Lists/List/List.H
+++ b/src/OpenFOAM/containers/Lists/List/List.H
@@ -45,7 +45,6 @@ SourceFiles
 
 #include "autoPtr.H"
 #include "UList.H"
-#include "SLListFwd.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -404,15 +403,8 @@ public:
         }
 
         //- Same as push_uniq()
-        FOAM_DEPRECATED_STRICT(2022-10, "push_uniq()")
+        FOAM_DEPRECATED_FOR(2022-10, "push_uniq()")
         label appendUniq(const T& val) { return this->push_uniq(val); }
-
-
-        //- Copy construct from SLList
-        explicit List(const SLList<T>& list);
-
-        //- Copy assign from SLList in linear time
-        void operator=(const SLList<T>& list);
 };
 
 
diff --git a/src/OpenFOAM/primitives/strings/lists/hashedWordList.H b/src/OpenFOAM/primitives/strings/lists/hashedWordList.H
index a9f63bfb17..fc9f5f8026 100644
--- a/src/OpenFOAM/primitives/strings/lists/hashedWordList.H
+++ b/src/OpenFOAM/primitives/strings/lists/hashedWordList.H
@@ -193,7 +193,7 @@ public:
         void push_back(const word& val) { this->push_uniq(val); }
 
         //- Same as push_uniq()
-        FOAM_DEPRECATED_STRICT(2022-10, "push_uniq method")
+        FOAM_DEPRECATED_FOR(2022-10, "push_uniq method")
         label appendUniq(const word& val) { return this->push_uniq(val); }
 };
 
diff --git a/src/mesh/snappyHexMesh/snappyHexMeshDriver/snappySnapDriver.C b/src/mesh/snappyHexMesh/snappyHexMeshDriver/snappySnapDriver.C
index 9a6d3f9b97..a37f5de341 100644
--- a/src/mesh/snappyHexMesh/snappyHexMeshDriver/snappySnapDriver.C
+++ b/src/mesh/snappyHexMesh/snappyHexMeshDriver/snappySnapDriver.C
@@ -2670,8 +2670,8 @@ void Foam::snappySnapDriver::doSnap
             surfaceZonesInfo::faceZoneType type;
             if (meshRefiner_.getFaceZoneInfo(fz.name(), mpI, spI, type))
             {
-                bufPatchIDs.appendUniq(mpI);
-                bufPatchIDs.appendUniq(spI);
+                bufPatchIDs.push_uniq(mpI);
+                bufPatchIDs.push_uniq(spI);
             }
         }
     }