I had it in previous havoc if I remember rightly and of course in stock, so I used to disable it manually as never needed it. but now in latest havoc I don't see it installed anywhere, but still sometimes it appears in google plat. but I confirm I clean installed latest havoc...Google AR is installed on my 3 XL, but that may be because I took an update. I have it hidden with LC, but it is actually showing an icon in the drawer. My stock/rooted P3 has it somewhere (I can see it as able to be hidden with Magisk Hide) but there is no icon. That may be why you don't see it (something different about the app on P3). Check Magisk Hide to see if is available to be hidden. I think I figured out how to get rid of the library nag of previously installed apps after reinstall, BTW. From computer... My Google Activity https://myactivity.google.com/myactivity?authuser=0 >Other Google Activity>Google Play Library https://myactivity.google.com/page?utm_source=my-activity&page=play_library >Delete All. After doing it, I opened Play Store on the device and everything was normal except the 10 recommended apps were gone from the library.
not sure to understand what problem you had with google play, but I have all disabled in google settings (activity, history, locations etc etc) so don't think it is something that affected me. my previously installed apps just appear in last "collection" tab of google play, but they don't hurt, I mean I just leave them there and sometimes I delete them all with the cross on the right to make some order

