Created attachment 222652 [details] obsolete file Upgrade from 12-Stable tio 13-Stable removes 'boot1.efifat' but not 'gptboot.efifat'. This one contains an old and improper BOOTx64.efi, not compliant with openZFS new features.
https://cgit.freebsd.org/src/commit/?id=dd9b24be14d4311ca6056f41a2d81801d2c0fa03 fix this. To be closed.