I only use SanDisk "Extreme" cards after finding some knock-offs and others unreliable. 100% reliability with these cards as long as I buy them direct from SD. Hopefully they keep their quality up and not too many "clones" start to appear. For now, all good. I also have tried this on 2 other 256gb cards I have and it's entirely repeatable every time.
However, I've been wrong before, so I would be happy to test all these cards (and some other brands too), is there a "built" program anywhere for MacOS?
Ok, so moving on...
I downloaded RPI-OS 64-bit, and didn't even need to do the rpi-update, it failed without that. So, I feel pretty confident that this is a bug in the latest RPI kernel, since it doesn't show up when I install Ubuntu, Moode, LE9, LE10 or any of a number of other distros on this same card (and 2 others I have)
RPI-OS 64-bit: