Unreal Engine Issues

Editing a spline component in 5.4 no longer fires construction events.

Licensee found that in 5.4 the spline component when edited in editor, no longer triggered the construction script potentially breaking their art pipeline. The licensee mentioned the cause is likel ...

Attachment changes on the client for non-replicated actor may be stomped by replication

For projects relying on attachment to be performed on the client before the server, such as to prevent latency, this can result in attachments being overridden when USceneComponent::OnRep_AttachChil ...

Physical Material Mask does not return the correct value

YCoCg to sRGB?

Both the material and the Niagara compute shader use the same function to interpret the YCoCg color data, but the Niagara compute shader returns an incorrect color. Also found on CL: 32347737 in Re ...

UE5.4 Preview 1 produces rendering artifacts on Landscape with World Position Offset

A material on a landscape with WPO will cause major ghosting, even if that WPO is a dynamic {0,0,0} ,such as from a black texture. ...

MustBeMappedGUID errors after several seamless travels

This seems to be the same issue as was reported in [Link Removed], as enabling net.ResetAckStatePostSeamlessTravel resolves the issue. However, it was recently reported that disabling net.FilterGuid ...

Blueprint Instanced Variables Data Erased

Instanced variables were given a fix in response to this issue: [Link Removed] Once implemented, when the project is compiled the data from the blueprint instanced variable is removed. A recommend ...

Crash when adding a spawnable volume to a Level Sequence when Draw Brush Polys is enabled in the level editor

GetMonitorSizeFromEDID may fail to acquire the native resolution for ultrawide monitors

For some ultrawide monitors, UE may not correctly fetch the native resolution. GetMonitorSizeFromEDID attempts to retrieve native resolution from the Detailed Timing Descriptor of the EDID, but thes ...

NMT_Failure message not received on client when listen server shuts down

Shutting down a dedicated server seems to result in the expected behavior, where both messages are received, but it may be possible for the circumstances causing the issue to occur on a dedicated se ...