Invalid Imposter fails when trying to copy a transformed pokemon

[F3L1N3F1N3]

Had this interaction in a game (turn 13): https://replay.pokemonshowdown.com/gen9randombattle-2206792752-8o2ec5yb42zf937trfh9iy6lzpbc0abpw
Didn't know imposter worked like this. I checked the page for Ditto and Imposter and it wasn't mentioned at all. First time seeing this interaction and it kinda mattered I think. I'm pretty sure it's intended but I just also think it should be documented somewhere since it really SEEMS like it should work.

 

[UT]

That is a correct mechanic; both Imposter and Transform fail against an already-transformed target.