Unreal Engine Issues

Adding parent constraint to control rig in shot crashes the editor

Adding a constraint to a control rig in a subsequence will crash the editor. ...

Editor crashes when a floating window PIE command is issued repeatedly

After assigning Keyboard Shortcut for New Editor Window (PIE) as "F3" and returning to Viewport and selecting "F3" to open New Editor Window (PIE), continuing to repeatedly press F3 results in the e ...

Crash when using Get Start/End Frame (Seconds) node with MovieSceneSection have no opened bound

If use Get Start/End Frame (Seconds) with GetStartFrame has a section isBounded is False, eg 3DTransformSection, editor will be crashed. Specifically, a following code occur crash. inline FFrame ...

WP Builders: The Datalayer states forced in UWorldPartitionBuilder::LoadDataLayers can be lost

A licensee reported that Datalayers that are added to UWorldPartitionBuilder::IncludedDataLayers in a custom builder PreRun are not respected.   I used the minimap builder to debug the state of t ...

Assertion when trying to break LevelInstanceActor when its level isn't current

Crash when changing details of an animation in an Animation Composite

This is a regression tested in //UE4/Release-4.27 CL#18319896 Fatal error is thrown and the Editor crashes when changing details of an animation in an Animation Composite. ...

Editor crash when modifying Skeletal Animation Section of an unsaved additive animation

Unsaved animations can cause the editor to crash if they are in a sequence, if the sequence evaluates them after an edit.  ...

Copy-pasting an actor property that is a set of strings adds extra quotes and escapes

Copy-pasting an actor property that is a set of strings adds extra quotes and escapes. The licensee has reported: The problem doesn't happen for example for properties of types set of integers, nor ...

Float Curve that is set as a local variable in an actor's function is garbage collected when in Standalone, causing a crash

If a Curve Float local variable is created for a function, it will be garbage collected when garbage collection occurs. This causes the process to crash due to an null pointer error whenever it is r ...

Grabbing a Destructible Mesh Child blueprint with a Phsyics Handle crashes the editor

Grabbing a Destructible Mesh Child blueprint with a Phsyics Handle crashes the editor during PIE. NOTE: This issue occurs whether or not simulate physics is active on the destructible mesh compone ...