Did you also set it as boot when creating?
(In addition to setting the mount point)
It looks like you did based on the printout…but confirming.
the 2GB thing isn’t quite a hard limit - I actually install with an unbootable partition setup in the installer, clicking through this warning, and it still places the bootloader that I choose at the right place in the filesystem…even if it’s useless for booting.
Seems like a bunch of people having bootloader issues currently. My (zfs-centric) approach would probably/possibly work, or manually installing another bootloader of your choice after the install.