Another data point. My first flight on Austrian. At check-in, my UA*G was accepted, but Exit Row seats on VIE-MAN were still chargeable at 25 euros. Also thought it was weird that the system was offering to sell me lounge access even though I can access it as part of *G

Boarding pass looks good - priority boarding listed (zone 2) and recognition of UA*G, but no exit rows like on LH and LX.