I just switched to testing from stable; I’m still seeing a core dump with ModeManager 1.18.4 that I reported here: [ARM Stable Update] 2021-12-13 - Firefox, KDE Gear, Thunderbird, LibreOffice, ICU and Kernels - #12 by thwright. Downgrading to 1.18.2 resolves the issue.
I’m also seeing what I reported here:
Let me know if I can provide more info.