Same here.
Go to Android Developer Settings > Display Cutout, set it to one of the other options and it should shift the app down a bit so you can access the buttons. (change it back after ofc)
I used “waterfall cutout” but others might work depending on your phone model. Afaik no other fix is possible without the app’s code itself being modified.
0x0f@piefed.social 5 hours ago
For me it worked to rotate the screen, then the buttons worked.