FYI in Macrumors [1] forum users found that when connected via thuderbolt 4 in Apple Silicon Macs, you dont get the full resolution, because MacOS does not enable DSC. In short you get max 6016 x 3384 instead of the native for the monitor 6144×3456.

You have to either use the HDMI port from the Mac (if you have an M2 one) or use a usbc to HDMI converter which for some reason triggers the DSC.

[1] https://forums.macrumors.com/threads/dell-6k-u3224kb-monitor...