Hi, VivenThen.
I had this issue as well. Exactly like yours: only PP that closes, whereas Word, OneNote, and Excel don't. I had tried many ways, including doing a factory reset, however, the problem persists.
Finally, I've solved the problem. I found that it had something to do with my antivirus installed on my laptop. The antivirus was McAfee which was preinstalled on my laptop. After removing the antivirus, the issue was gone. Currently I only use Windows Defender. I haven't tried other antivirus because I'm worried it will have the same impact as before.
I don't know if the same solution applies to you too, but maybe you can give it a try.