Won’t break routing traffic over Tor. Worst case in theory would be to not route any traffic at all. Zero connectivity. Or slow speed.
Safe. During upgrades (as in apt dist-upgrade) more RAM may be required. (512 MB)
We have a lot reports of people having issues on Windows 10 hosts which had no issues once they used a Debian based host such as this one:
Gateway startup Error: Not Syncing: no working init found - #13 by BlueDevil