Biosboot partition not recognized during installation

The prerequisites are setting your board firmware to CSM only and the bios boot partition has to have the correct flag set which I have not been successful in setting with the tools I used. Others have been successful so it is just me. Disk sdb 12 is identified as EFI, is that just a fat 32 partition? Also it may be that the bios boot partition is too far back. I don’t think it needs to be the first but you are telling the system to use bios boot rules which does have limitations on the boot sector location.