The change likely causing the change in behaviour isn’t made in Kodi, it’s made here: [package] [vero3-userland-osmc] ALSA: Update AML-M8AUDIO.conf · osmc/osmc@2b2b23d · GitHub.
The change was to fix issues reported here: Multichannel audio incorrectly mapped - #50 by sam_nazarko
Can you explain whether you’re using passthrough and post some logs?
Sam