For my part, I had some "minor" inconveniences.
First, your application risks not to be signed any more : you have to sign it manually (with possibly an update of your profile from XCode).
Not very nasty !
Secondly, a little more annoying : you cannot any more "commit" your files and XCode proposes you this message :
In fact, you are disconnected from your repository !
The solution is simple :
1/ open Terminal
2/ write these commands :
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