Warriors of the Nile 2 & Others

On nearly every single game launch I get the following pop-up with message:
Failed to initialize graphics.
Make sure you have DirectX 11 installed, have up to date
drivers for your graphics card and have not disabled
3D acceleration in display settings.
InitializeEngineGraphics failed


Using the flatpak version on Ubuntu. All drivers are up to date, following the instructions on the GitHub. Programs launch flawlessly on other clients such as Lutris.
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