Unreal Engine Issues

Level Instance: failed check in duplication code when embedding

Mentioned in this UDN is the possibility that duplication of some actor fails because their BP as been deleted.  ...

TriggerMontageEndedEvent will clear queued notifies for all instances of a montage

When a montage finishes and TriggerMontageEndedEvent is called, all queued notifies for that montage are cleared. However, this assumes that there is only one instance of the montage active at any ...

InstanceDecorators of URichTextBlock is increased everytime add it to viewport

URichTextBlock::UpdateStyleData() does not check whether DecoratorClasses already had any specificed DecoratorClass. So every time you turn UMG on and off from the Viewport, Decorator Classes will i ...

Background blur missing with HDR CompositeMode 1

UPD: According to Affects Version field, issue reproduces in 4.26, Regression for 4.27 - No. ...

[Submix][Recording] - Existing Sound Wave to Overwrite option has no effect

This is an old bug that looks like it never made its way into JIRA. Adding for documentation.  ...

Movie Render Queue does not render letterboxes to exports with sensor aspect ratios between 16:9 and 1:1

There is a discrepancy between how Movie Scene Capture (Legacy) and Movie Render Queue handle letterboxing for sensor aspect ratio's that do not match the export resolution, which seems to be a bug ...

Forward Rendering MSAA causes black outlines of meshes when partially occluding Sky Atmosphere

Single Frame Blendspace doesn't sample root motion

Single Frame Blendspace nodes don't correctly sample/generate root motion. The reason for this is because of how we calculate the delta to bump the sampling within the blendspace each frame. In a ...

Making a Movie Scene Section Parameters struct in Blueprints will use the incorrect Can Loop values

Can Loop is the edit condition for two other values in the struct, and those will have values by default when the node is created, so Can Loop will be true in the make struct node.  You can work ar ...

[CrashReport] TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,EActiveTimerReturnType ,FDefaultDelegateUserPolicy

Generated from CrashReporter likely the same issue - [Link Removed] but hasn't been brought over to UE5 EA ...