Hello Robin!
wow – you pointed me absolutely in the right direction!
It was in the settings –> the option for simple metadata reading was somehow enabled (I think it was my fault although I don’t remember that I enabled it because everything worked just fine until then). But that was the cause. Already tested it and now all new images show GPS data again!
I am REALLY glad that it works now 🙂
Thank you so much for your help – really appreciate it!!
All the best,
Tobias