I have owned a bunch of Mausers. None of them were loose in any way except that when the bolt is all the way back it has some play which is the way they meant it to be. I forget why but I have read that.
I’ve never heard that it was “meant” to be loose like that...I assumed it “just was”. In full retraction the bolt is held stable only by a little stub of the bolt body and the locking lugs, whereas further forward there’s more of the bolt body, receiver guideways and charger bridge to hold it steady.