You are running nvidia on wayland.If you are fine with not using your nvidia card for recording switch the encoder to h.264.
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Honestly I'd recommend going to ~/.config/obs-studio
and making a backup of your scenes then deleting the originals. Start up OBS and set things up again.
I've had similar issues when switching between KDE Plasma and sway, if I left the old scenes there OBS would break after switching enviornments. Once I deleted the scenes it would work fine.