Code Cleanup does nothing in a single project out of many in a solution

I'm at my wit's end. For some reason, code cleanup (and quick code cleanup) has simply stopped working completely in one project out of several in a solution. I have tried deleting the .idea folder, I've tried deleting the .bin and .obj files, the .dotsettings files... to no avail. I have no idea where to go from here. The configuration as displayed in Rider, for the code cleanup, seems right.

I can't find any error messages happening either. It simply does nothing. Is there some log somewhere? Does anyone have any idea what I need to look for?