Wrong default resolution - ultra widescreen (5120x1440)

Hello folks,

I'm currently trying to make my Big Sur Installation to work properly. The installation went till now pretty smoothly (Thanks to Casey's famous guide for the Designare Z390).
Unfortunately I do have a bigger problem with my Samsung C49RG9x monitor. In Mojave everything works as expected (the default resolution is set to 5120x1440), but in Big Sur the default resolution is always set to 2560x720 (all monitor elements are scaled by two, the output resolution seems to be...

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Author: Chrismastree2412