Unreal Engine Issues

Changes to RuntimeFloatCurves do not propagate to child BPs until the Editor is restarted

Any changes made to a RuntimeFloatCurve will not be propagated to child Blueprints until the Editor has been restarted. ...

UMG Children broken in Build packaged with Nativization

Child widgets not visible when packaged with inclusive nativization on. "The problem is that ChildWidget never shows up in the package build, but shows fine in the editor. I've debugged the issue ...

Crash serializing LAN query response in OnlineSessionInterfaceSteam

Server will crash in FOnlineSessionSteam::AppendSessionToPacket due to the OwningUserId being null. ...

Crash caused by Buffer Overread in TBitArray operator < function

A licensee has reported a crash that is caused by a Buffer Overread in TBitArray's operator < function. While the licensee did not provide reproduction steps, the crash is apparent from looking at t ...

Modifying collision shapes on a Skeletal Mesh with multiple cloth assets crashes

For skeletal meshes with multiple cloth assets in use, modifying any of the bone's collision body setup in the physics asset causes a crash.  ...

Actors in TMap Blueprint Properties are not copied properly for PIE

Actors that reside in TMap blueprint variables refer to the Editor actors not the copied UEDPIE actors (that we'd expect) when accessed in PIE. This is not the case in standalone; this only occurs f ...

Undo Crash with Reroute node into Class pin of SpawnActorFromClass

Crash on undo with SpawnActor node that uses a reroute pin in class wire. "It looks like the variable promotion marks the blueprint as structurally modified, which triggers a skeleton compile, wh ...

Logs containing UTF-8 characters don't appear in CMD/Terminal on Linux

If a log message contains UTF-8 characters like "ő" or any Russian one ("л") it won't be printed to cmd or terminal but it will be printed to the log file. This is a regression from 4.19.2 (CL-40337 ...

Custom node with SceneTextureLookup function doesn't support on Mobile anymore

Component default data can be lost for a non-nativized Blueprint class that inherits the component from a nativized parent Blueprint class.

This is a regression that was introduced by the fix for [Link Removed]. The fix makes an invalid assumption that instances of components whose archetypes are inherited by a non-nativized child Blue ...