[itsme]

I also know the issue with transposing and it can be even more complex: I have chordpro songs in my library that I play in different  keys with different fellow musicians. Several "songs" in different collections that share the same chordpro file. Only one song uses the original key of the chordpro file, other song(s) already transposed.
The typical sitation: in a jam (I enjoy meeting other musicians in a pub) a different key is requested. Great that transposing is possible with just a few clicks. But usually there's not the time to revert everything afterwards and the changed transposition is forgotten.
My current work-around is a (visible) note in the shared chordpro file in the subtitle or in a comment like "if I sing C, with band A in G, with band B in A" or the like. Not an elegant solution, just a work-around and a useful reminder.