It appears the build is using -no-upgrade but for me syncthing is still attempting to update itself. Not sure if it's a failure of the code, or something messed with the build system or what. Thanks!
I'm going to bump to 0.13.7. I guess you'll have to wait for the next update to reproduce. Maybe you should file this bug upstream. I can confirm that this happens in 0.13.5: > 15:10:08 WARNING: Automatic upgrade: open /usr/bin/syncthing460156054: permission denied
This might be related: https://github.com/syncthing/syncthing/commit/1753771356207382999a86091a68646bfe9ee166
I haven't seen this for a bit so I'm guessing it's all squared away at this point. Thanks!