Hi @Daniel_Met,
Thanks very much for the testing and feedback!
So, yes, we’ve also just discovered and fixed the issue and this fix will be released with -beta2 in the coming days.
Just for reference here is the issue, the PR with the fix and it’s on our 4.6 tracking to-do list here (look for "Copter AutoTune can produce very low maximum acceleration values ")
Thanks again and sorry for not getting the fix out before you bumped into it!