Unreal Engine Issues

Material Instance used textures list shows sample textures used as Input Preview Textures within Material Functions

Nanite Meshes with WPO exhibit TSR smearing with Velocity Write during Depth Pass, regardless of Mobility

I set up a test project with different combinations of Nanite/Non Nanite, Movable/Static, and instance and component types, and the only case that seems to not smear at all are the non-nanite Movabl ...

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 ...

When the default values of Instanced variables are changed in Blueprint, the variables of actors on the level don't follow the default values

When the default value of an Instanced variable defined in C++ is changed, it is not reflected in the default value of an Actor placed on a Level. In the reproduction procedure, when the default v ...

Niagara Mesh Renderer causes GPU hang on IOS 13.4.1

SubCategory of UFUNCTION does NOT work properly if using CallInEditor

If you use both Category hierarchy and CallInEditor in UFUNCTION, it will result in an unintended sequence as shown below. [Image Removed] And, the following code can solve this issue void FDetai ...

Autosave Causes Outliner to Lose Content in Blueprint Sub-levels

When Unreal autosaves, any items in the outliner from a sub-level that have been switched on by the sequencer track disappear, BUT only in the outliner, everything else can still see the scene fully ...

Level instance in unloaded data layer stays loaded.

[Waveform Editor] - Waveform Editor has noticeable latency with larger files [investigate/profile only for now]

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 ...