Put two rolls through my Yashica 124G at a fiddle festival on Sunday -- one PX125, one 400TX.
Always learning --- the camera, which I hadn't used in a while, had a marker of mine in the accessory shoe indicating a film, but the counter dial was not on a number. I thought it was empty, I just forgot to remove the marker, but took it to the darkroom to check -- oops, there was film in there!
So now I know, opening the back resets the counter.
I took 2.3 frames on the backing paper at the end -- hate when that happens! (Fortunately it was nothing rare and important.)
Developed in my usual HC110 1+63 one shot.