I had this as well, the only workaround i've been able to make work is to close down steam entirely, including exiting steam. Then navigate to BG3s SteamLibrary\steamapps\common\Baldurs Gate 3\bin directory and launch the game directly by clicking either bg3.exe or bg3_dx11.exe depending on Vulkan or DirectX11.
In another forum thread others reported the issue being fixed by deleting the HotFix2.pak file and then verifying integrity of the game files through steam.
Last edited by skyri; 12/08/23 07:46 AM. Reason: extra info