NEXUS-6048, I created the "Remove Releases from Repository" and in my naiveté assigned it to the Central Repository (biggest available without doing anything). I later learned that this was just for hosted repositories.
I felt this could be better in NX3 and only show the repositories allowed (why show a proxy if proxies arn't allowed/task is for hosted).
I did check Dizzam-SNAPSHOT and this behavior was the same there.
Interestingly, this seems to be already requested in NEXUS-6395 but this still seems outstanding to me. It is possible this is a bug and this task was missed, but I'm leaving Improvement for now.
Because of this, if I find more tasks this affects, I'll make a list below.