I also have this problem.
Curiously, the same data amount of 223MB (not GB) is also identified as as system junk.
Cleanup hangs -or takes a long time- to move on from 75% scanned when scanning for "system junk" files, and it's a slow crawl toward 100% scanned from that point forward.
I also see that Windows Module Installer and Worker begins grinding away after each cleanup use.
Is it possible that Cleanup is detecting and removing something that Windows does not want removed or is possibly essential for Windows?
This topic was raised March 28; it's now May 26 and no responses from mods or other users almost 2 months later.
What to do?