For the Sonarr/Radarr rename, I'm quite puzzled as instead of a rename, it seems to be issuing a link command:
2019/08/26 13:36:34 DEBUG : TV/Undercover.Boss.US/: Link: req=Link [ID=0x5040f6 Node=0x135a Uid=1000 Gid=1000 Pid=2383] node 5043 to "Undercover.Boss.US.S09E06.mp4", old=TV/Undercover.Boss.US/Undercover.Boss.(US).S09E06.mp4
2019/08/26 13:36:34 DEBUG : TV/Undercover.Boss.US/: >Link: new=<nil>, err=function not implemented
I was testing that out as well and that is why it downloads/reuploads it. Both Sonarr and Radarr seem to do the same thing. I'll let you know if I see a work around for that.