SourceTree queries Stash on wrong URL with a very high rate (>250 tps)

We are using SourceTree to target our internal Stash server (version 3.4.3, 5000, not Data Center). The server is behind a nginx proxy. The base URL is: http://rndwww.foo.bar.net/git/

Problem:
nginx was flooded several time with SourceTree targetting a wrong url with at a very high rate (creating the first time a deny of service of nginx).
Example of wrong url:
http://rndwww.foo.bar.net/rest/api/1.0/users/kleboeuf/repos?limit=25
rate = 261 times per second

But the right url should be:
http://rndwww.foo.bar.net/git/rest/api/1.0/users/kleboeuf/repos?limit=25

The problem was reported a few minutes after an update of SourceTree. Unfortunately, I don't know the previous version. The guy was pushing and he had to stop SourceTree as it was frozen. No error message.