Complex collision mesh might lose its collision in the editor

This is affected by loading order. In the case, display mesh was loaded firstly and try to build collision mesh form complex collision mesh asset. But the collision mesh didn't finished to make Ren ...

Modified a mesh used as complex collision mesh does not affect the collision in the editor

Tools - Feb 17, 2020

When a user changes any properties (for calling PostEditChangeProperty ) in parent static mesh or restarting the editor, the modified mesh is applied correctly. how to reproduce: ComplexCM.mp4[I ...

Native struct types that declare one or more non-UPROPERTY fields are not initialized with the default value from a modified Blueprint CDO.

Gameplay - Blueprint - Feb 12, 2020

Dynamically-spawned instances of a Blueprint class go through an optimized property initialization pass (see UBlueprintGeneratedClass::BuildCustomPropertyListForPostConstruction() and InitProperties ...

Unable to input with IME in widget component.

Tools - UMG - Feb 12, 2020

Unable to input IME text in widget component, but able to input IME text in textbox like UMG designer.  It works fine until 4.21, however it wasn't able to work after 4.22. Workaround: void FSla ...

Particle System Components don't inherit owner's time dilation

Rendering - Cascade - Feb 7, 2020

This is a regression introduced by the particle system manager. It does not account for the owning actor's time dilation when ticking the particle system components.  ...

Input Key Selector's Set Text Style does not change Text Style when given Text Style Variable

Tools - UMG - Feb 6, 2020

Input Key Selector's Set Text Style does not change Text Style when given Text Style Variable ...

Reordering instanced components in the Actor Details tab invalidates the relocated instance such that it can no longer be registered into the current world.

Gameplay - Components - Feb 5, 2020

After reordering, if you hover over the "Component Blueprint B" entry, the object path indicates that it's incorrectly referencing a transient object. This is why GetWorld() now returns NULL and the ...

Opening Editor preferences window while simulating and pressing Play/Stop causes memory leak

Gameplay - Input - Feb 3, 2020

An open but minimized Editor Preferences window causes a memory leak while simulating and repeatedly pressing Play/Stop. ...

Planar Reflection Actor does not pivot at center when using ALT+LMB Drag in Viewport

Rendering - Jan 31, 2020

When moving a Planar Reflection Actor's transform location to (X:5000, Y:5000, Z:0)  The Planar Reflection Actor does not pivot at center when using ALT+LMB Drag in the viewport.   Note: Moving tra ...