I printed on some and it was ok. They do make latex compatible magnet...
https://www.magnummagnetics.com/digimaxx-latex/
That said it did curl a bit and caused a headstrike on the last set, which completely obliterated my head...it tore the whole bottom off the head since magnet is so dense. We don't do magnets enough for it to be worth it.. now we just print on vinyl and apply it to the magnet.
I'm sure we just had the heat too high, or we were supposed to attach it to the take up reel before printing, or something else.. So it's likely user error. But we print a magnet a month, if that... and usually it's reflective, so we didn't play around with it too much to say whether it works or doesn't.