Unreal Engine Issues

BlackboardComponent observer can be called for the wrong key

We need to, at least, prevent this by clearing observers when running a new BT using a different blackboard. Must also think that this might affect licensees relying on the current behavior (might h ...

TSR ghosting when see through translucent wall

see through a translucent material will cause ghosting  This issue did not occur in 5.0, it occurs when using TSR on UE 5.1 or later. ...

Syncing issue when stopping and blending out a non-looping montage to an anim graph

When syncing from a non-repeating montage that is blending out to an anim graph, the anim montage is marked as a follower due to having its PrevMaker as an AnimBoundary(-1), furthermore in this case ...

UResavePackagesCommandlet::CheckoutFile() logs warnings for skipped files

User reported. UResavePackagesCommandlet::CheckoutFile(const FString& Filename, bool bAddFile = false, bool bIgnoreAlreadyCheckedOut = false) has a parameter to ignore files that are already ch ...

FBasePassMeshProcessor crashes in ODSC code because the WorldGridMaterial doesn't support translucency

UDN: [Link Removed] Slack: [Link Removed] Then, the return value of TryAddMeshBatch is determined by FBasePassMeshProcessor::Process. When the crash occurs, GetBasePassShaders fails to get the shad ...

Make literal container nodes (e.g. MakeArray) do not cast object ref output terms linked to interface-typed input pins.

As with most nodes, object reference outputs can be directly connected to interface-typed inputs on "make container" nodes (e.g. "MakeArray") if the object's class type implements the interface clas ...

Niagara particles bounce instead of resting on AMD GPU in SM6

Additional Info URL [Link Removed]…]2F00O4z000006EGZXEA4%2Fview%3FqueryScope%3DuserFolders Link to repro - [Link Removed] Old UDN question that may be relevant, similar visual bug - [Link Removed] ...

Previewing a node overrides the output of PostProceessInput0 in a Post Process Domain Material after previewing has stopped

This is not a regression. Tested in //UE5/Release-5.1 CL20979098 Previewing a node overrides the output of PostProceessInput0 in a Post Process Domain Material after previewing stops. ...

HDRI Backdrop and Lumen compatibility issues

Build geometry removes spline component visibility

A spline component will become invisible after building geometry with the spline actor in the level. This issue is occurring in //UE5/Release-5.1 @ Binary CL 23058290 This issue is NOT occurring ...