Unreal Engine Issues

WorldPosition in PostProcessMaterial returns inconsistent results in AfterTonemapping with TSR and TAA

This behavior appears to be a regression new to UE5, as I tested in 4.25 and the issue does not occur. Interestingly, the issue clears up if you switch to No, FXAA, or MSAA antialiasing methods. Th ...

Level instance in unloaded data layer stays loaded.

[Waveform Editor] - Waveform Editor has noticeable latency with larger files

I've noticed as I've been working with the Wave Form Editor, that it works fairly well for smaller files, but on longer assets there can be some pretty noticeable latency when adding and adjusting t ...

Push based fast array with net.PushModelSkipUndirtiedFastArrays not replicating across multiple PIE sessions

The conditions for this bug are fairly specific. The actor must be statically placed, with its only replicated property being the fast array, and net.PushModelSkipUndirtiedFastArrays must be enabled ...

PoseSearch::GenerateDDCKey is not deterministic between editor restarts

we need to investigate why between editor restarts the DDC key generation for the motion matching pose search databases is not deterministic, causing the assets to be rebuilt ...

ISM Component in an instanced BP does not take into account changes to NumCustomDataFloats from the BP class

PerInstanceSMCustomData is bulk serialized and doesn't get changed on the BP instance when changing NumCustomDataFloats, possibly causing out of bounds array access leading to a crash. Possible sol ...

Game feature plugins load plugin config files incorrectly

Game feature plugins load config files in a different way than normal plugins, which is confusing and can lead to broken behavior unless the developer knows about these issues ahead of time. The loa ...

Cannot change Use Custom Mode or Swap Root Bone properties on Movie Scene Skeletal Animation Params

Two properties on the animation params are not exposed to BP ...

New Viewport Resolution setting increases every time a new PIE window is launched

When closing a PIE viewport, we write the size back to the New Viewport Resolution setting in case the window was resized during play. However, we do not account for the window border, and write bac ...

Use Camera Cut for Warmup does not take into account shot's camera cut track

Camera cut warmup does not take into account the shot's camera cut track when rendering from the master sequence. Rendering the shot alone will, however. ...