The Yashica 24 is not a common camera. The manual is available on-line, but I have the original manual that came with the camera. It says to only use 220 film, and there's a sticker below the pressure plate in the camera that says "Use 200 film only."
But, then there is a factory installed sticker than says "120 FILM START MARK." It is a puzzler.
On another web forum (sorry don't remember which one) in a discussion about using 120 film in the Yashica 24, a user said that sometimes you have to double expose the first frame. I had than happen with mine. If you have to do that, just put a lens caps on before pressing the shutter button, and you won't mess up the first picture. I shot with 120 before putting the yellow sticky-note spacers on, and it was not a smooth operation. Haven't tried it yet with the spacers, but hopefully that will improve it. I am curious just how much difference 0.004" will make.