Hi @kombistack,
it seems they have updated the filter functions (see https://github.com/sensorium/Mozzi/pull/165) and although they say that it should be backwards compatible, it obviously is not.
I developed for Mozzi 1.1. I have put that version on my site (https://www.oscillator.se/opensource/#m5stack). Can you try it and report back?
Thanks for using OscPocketM!