Unreal Engine Issues

Iris - high latency causes initial hitch for newly spawned actor's movement

This may possibly be due to FReplicationWriter::CanSendObject waiting for CreateConfirmation. ...

Slate Post Buffer does not work correctly when changing Default Back Buffer Pixel Format

Local fog volume rotation causes offset issues at high world position values

Local fog volumes have a substantial offset when placed at a far distance from world origin and is then rotated. This was not the case in 5.3 when tested under the same conditions, so this is likely ...

In BP/Python Editor Utilities, function SetEditorProperty() unexpectedly fails for Actor Reference Properties on External Actors.

As part of the Python and Editor Scripting Tools, it is possible to programmatically set variables in actor instances of the current level just like when using the Details Panel in the Level Editor. ...

Lumen screen traces from hair cast noising moving shadows on faces

There is moving blotchy noise on the head and face from hair when Lumen HZB tracing hits hair.  CL 33258050 fixes the noise in the hair, but tracing still hits hair when it starts from surfaces like ...

Bug with control rig display name and sequencer

Control Rig Tracks are not visible in Sequencer when the Name and Display Name are not set to the same value in the Control Rig graph, and the track filter is set to "Selected Control Rig Controls". ...

Blueprints might get corrupted after inheriting multiple times.

Blueprints might get into a corrupted state when they are inherited for a big number of times. Starting from a C++ class, if you then create a BlueprintClass from the C++ class, and keep creating ne ...

"Literal Enum" BP node outputs wrong value when the input pin is connected

This behavior was not observed up to UE 4.19, but it can be reproduced in all versions from 4.20 to 5.4. When a "Literal Enum" node is used inside a blueprint and an enumeration value is chosen fro ...

FDeferredDecalProxy cannot be initialized to not fade even if FadeDuration is set to 0

FDeferredDecalProxy always fade because InitializeFadingParameters is always called and leaves InvFadeDuration at 1.0 and the LifetimeAlpha calculation in FDeferredDecalPS::SetParameters gets a very ...

FFragmentTypeParameters is missing a default initialiser for FFragmentTypeParameters::Flags

FFragmentTypeParameters misses a default initialiser for FFragmentTypeParameters::Flags. This can lead to Flags being left in an undefined state, which can ultimately cause non-determinism during th ...