When reports and semantic models live in different workspace there is no problem, the byConnection will be preserved when exporting to Git.
Only when both report and semantic live in the same workspace, when exporting to git because they are in the same workspace the definiton.pbir of the report will be by default as a relative byPath connection.
But it's still a problem that it's impossible to properly work with reports with a Live connection while integrating them in Git.
To be honest, I don't care about why.
The fact is that it's a pain.
