Assuming the log messages are accurate, it seems only engine textures were updated (outside of the media texture in the scripts folder, which purportedly changes every time). I’m very surprised that did the trick, as I didn’t think engine textures could cause any issues.
Very glad it ended up fixing your issues though! I’m a bit busy with other projects (I’ve had to downgrade from this version of Unreal due to other bugs), but when I get a chance, I’ll add a third button in the master branch that includes textures with empty GUIDs.