fcpxml missing audio if camera has 8 tracks

Hi, when doing a xml output of fcpxml to use with X2Pro or Resolve, the audio gets missing if:

You don't have ALL of them turned on... So if I shoot with an FS7 and import and keep all 8 audio channels on, and then mute/turn off 7 of them and only keep ch2 on (which has my mic), then the XML will have NO audio... only parts with nothing in them...

Leaving all 8ch on, works fine, but then I have to clean up in my DAW...

This worked brilliant and perfectly before... is it FCPX 10.4.9?

It can not be X2Pro, as it is also a problem in Resolve, and resolve reads 1.8... so it seems to be FCPX problem.