I have a similar bug:
LogCook:Warning: Found unparsable ini setting Windows.EditorPerProjectUserSettings:DetailCategories:SideScrollerCharacter_C.Character Movement: Walking:0 for platform AllDesktop, invalidating cook.
This is in a side scroller template project with a few changes… I am not sure if it produced this bug in previous versions. I am a noob and accidentally clicked “Launch” for the first time.
It doesn’t impact me for now, I just wondered if I could help replicate this bug more.