Problem with .kbm files?

Recently someone told me that Vital has issues with .kbm files, but I can’t find any details or documentation of this bug. Does anyone know where I can learn more about this (possible) issue? AFAIK from my searches there IS an issue with .tun files (specifically with MIDI note 127) that doesn’t happen with .scl/.kbm, but if there’s also an issue with .kbm files it would be good to know the details.

Thanks in advance!