Passthrough Changes

I have a Fire TV stick that I have tried Kodi Isengard and Jarvis and even SPMC builds on, but could never get audio passthrough to work.
I eventually gave up and uninstalled them.
When I read about some changes to be made to Kodi Krypton regarding audio I thought I would give it another try.
When I installed Kodi 17 beta 1 passthrough worked immediately without issue, but when I updated to beta 2 passthrough was again broken.
And has remained that way with every other build up to beta 5,
What changed between beta 1 and beta 2?
Included are the logs for beta 1 and beta 5.

kodi 17 beta 1 log

kodi 17 beta 5 log