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Thank you very much, Theo!
I've already found the review by Pjotr Oosterbroek and other papers via Catalogue of the Craneflies and I think it could be belgica or lutescens. The other species all have specific visible characters or were not yet! found in Bavaria. I'm trying to find more photos to compare - and hopefully find more in January 2022.

Met vriendelijke groet uit het ondergesneeuwd bos in januari, Eric (op jacht naar de sneeuwmug) ;)