I have some 1/4 “metal film” these are smaller package and looks wise are much better. Ordered when I wanted some parts quickly (Amazon prime). Measured fine in tolerance and look fine. Guess what happens when I put the heat gun on them, they drop resistance.
Either I’m unlucky or there is a high chance unbranded metal films are often actually carbon film.
There is a high chance, because you are buying from crappy anonymous outlets. Mouser/Digikey/etc, reputable distributors for electronic parts ship just as fast as AP. And paying 2-3ct for a quality part is definitely worth my peace of mind.