I was too lazy and jumped to conclusions too quickly with Закарпаття ФМ 101.9 yesterday, I'm sorry if I provided wrong information.
The RDS seems to be fixed now after I checked with a TEF6686 tuner. Doesn't work anymore between 56-84kHz BW and works properly on 97kHz-311kHz (doesn't get stuck, the dynamic PS flows continuously). The sound seems to be different as well, but I can't confirm that 100%. 89.1 still sounds much better but maybe it's because it's not as loud.