I was also woken up after a 2 hour sleep.
My wake time as set for 06.30 here in Vietnam but actually I was Out if bed, still very tired and only saw after a minute at was 6 hours early. (Time difference between NL and Vietnam).
I do think it was caused by being on airplane mode while is switched off auto time zone allowing me to set Hi Chi Min time.
This so that it was easier for me to see the remaining flying time.....
Then at night I did activate my alarm time but it seems to me these are two different applications in the back not communicating zone differences when auto zone is switched off.
Strange to see me being put on my feet in the middle of the night, so be in for a surprise in case you decide not to switch on auto time zone.
Having read about the auto change the time zone switch, I have no knowledge of time zone being auto changed as I did this myself, this is what happened to me and think our problems are related, I hope it is fixed soon.