I sync a folder containing multiple git repos, never had a corruption happen.
@jwr can you link the issue you reported?
The only major issue I had was performance on TrueNAS/FreeBSD, Syncthing tends to keep a lot of files open. Increasing maxfiles/maxvnodes fixed it. [0]
On a sidenote, what's the point of these limits if your entire system becomes unusable if you reach them?