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Thanks for the prompt response! And no worries; I still have at least one fallback OS to play it on.

I checked the issue raised in the libGDX project. Unfortunately I'm running the game on a MacBook (not MacBook Pro) so there is no GPU switch available. However, I'm using an external monitor which was also mentioned - so I unplugged it, but the issue remained.

I have experienced issues with using the LWJGL3 backend before; LWJGL works just fine. I will spend a bit more time looking for a solution and will report back here if I stumble upon something.