[BUG] Critical bug in salt [3001] whith git remote backend and `gitpython`

Description

Following this bug, I have noticed many other bugs while refreshing or synchronizing stuffs in SaltStack 3000+ with a git backend.

Indeed, I have custom modules. These modules were not synchronized this morning. I had to force the synchronization with salt '*' saltutil.sync_modules.

However, then, I had a really serious bug with my pillars. I was not able to synchronize these informations anymore. I was wondering if this was related to the way I am synhronizing those pillars with git backend using GitPython, so I switched to pygit2.

The problem on this master is gone but is still present on masters using GitPython.

Setup
Create a pillar sls file and try to synchronize it through gitfs backend and gitpython with, at least, salt-master 3000.3 and 3001. I am not sure, but it seems that old 2019.X are not affected.

Versions Report

As already said, this bug also affects salt-master 3001.

Upgrading configuration and software in order to use pygit2 solves this issue:

Best regards,
Rémy

edit : it only affects salt 3001 and not 3000.3

Start by reproducing gitfs synchronization with GitPython on Salt 3001, including saltutil.sync_modules and pillar synchronization, using the reported Ubuntu and dependency versions. Compare the behavior with pygit2 and the stated Salt 3000.3 setup. Done means the affected custom modules and pillars synchronize successfully through the GitPython backend.