Unreal Engine Issues

LayeredBlendPerBone with BlendRootMotionBasedOnRootBone set incorrectly calculates root motion weightings with more than two sources

When BlendRootMotionBasedOnRootBone is true, the code in  FAnimNode_LayeredBoneBlend::Update_AnyThread that calculates the root motion weightings for the sources doesn't appear to account for the po ...

When transferring data from CPU to GPU particles using Array, if CollisionQuery is used simultaneously, the Array cannot be read correctly.

Investigate crash with replication nested ever changing attachments

There seems to be an issue with replicated attachments ending up causing cyclical setups resulting in crash on clients. It was reported for 5.2 but even after patching up code it seems to occur. ...

Capsule component renders incorrectly with non-uniform scale

Capsule component renders incorrectly with non-uniform scale because the render uses the minimum between the X and Y values and the collision code uses the maximum between the two. This issue is men ...

Struct that is referencing a Custom bp Class will reset to default values on editor restart

Struct that is referencing a Custom bp Class will reset to default values on editor restart User Description: Making a array of object types in a struct. the goal is to have a struct containing wa ...

Startup Movies Black Screen in Packaged Projects

Startup movies displaying black screen in packaged projects. Tested with 4.20p3 4135216 and 4.21 4157973 ...

StopMontage with different BlendOutTime not taken into account after first StopMontage

When an animation is currently blending out due to automatic blend out or GameplayLogic, further StopMontage with specific BlendOut will not update the time to blend out of the current blending out ...

Editor Crash When Using FRequestPlaySessionParams GlobalMapOverride To Load World Partition Map

The licensee has been using a custom CVAR to launch directly into PIE for a world partition level. Since updating to 5.4, this now causes an editor crash. The main factor appears to be whether or no ...

Tick delta time does not provide the time between ticks (as stated in documentation)

In the description for delta time given for the tick event it states "Game time elapsed since last call to Tick". This sounds as though it is supposed to calculate the time in between ticks. However ...

Post Process Ambient Cubemap Tilted

User imported a custom image in the correct format to be used as an Ambient Cubemap within the Post Process Volume. Enabled detailed lighting mode by pressing Al+5 and the image has been tilted/of ...