Unreal Engine Issues

Exporting a spawnable through Python doesn't work

User-instanced subobjects owned by a streaming sublevel's Blueprint CDO cannot be garbage collected with the owning world after the sublevel has been reloaded in the editor.

Strong object reference properties of an 'EditInline'-decorated UCLASS type embedded within a native C++ struct definition can be instanced at edit time by the user as part of a variable's default v ...

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

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 ...

DFAO has ugly result on Hair Material with Custom Tangent

ProRes 4444 files cannot be played on MediaPlayer when RHI is DirectX 12

This file can be used if you have enabled the Apple Pro Res Media plug-in. This can be played when RHI is set to DirectX 11, but not when changed to 12. The file being played is a ProRes 4444 vide ...

Compiling a grandchild Blueprint via automated test can lead to crash

The crash doesn't happen if the blueprints are loaded ahead of the test by opening them, or if you compile all of them in the same test run. ...

Unable to input with IME in widget component.

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 ...

Show collision can't display Complex Collision Mesh

"viewmode collisionpawn" and "viewmode collisionvis" can not display complex collision meshes as well. ...

Get Tracking State does not change in ARCore

On android, there is no way to detect when an image is not tracked by the camera anymore. Once the image is tracked, the tracking status of the image is always "tracking". According to GoogleARCore ...

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

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