I think you reproduced the problem. Looks like a bug to me.
The size selected should not cause that black square. 🤷♂️
I'll try changing the size on the one that fails other than the sizes you mentioned. 😉
I set it to 4 and it is fine.
Thanks for the workaround, I will update the FBH report.
It may be related to the display adapter and driver. This one is an Intel UHD ARC.