rollback-altboot (broken init) failed on Surface Go 2 at OS version 2.73.1+rev3 and on Surface Pro 6 at version 2.45.1+rev1

[floion]

rollback-altboot.service - Balena rollback checks altboot
     Loaded: loaded (/lib/systemd/system/rollback-altboot.service; enabled; vendor preset: enable>
     Active: failed (Result: exit-code) since Mon 2021-09-06 11:14:41 UTC; 8min ago
    Process: 1004 ExecStart=/bin/sh /usr/bin/rollback-altboot (code=exited, status=1/FAILURE)
   Main PID: 1004 (code=exited, status=1/FAILURE)

Sep 06 11:14:41 localhost sh[1004]: Rollback: Parsing bootloader configuration
Sep 06 11:14:41 localhost sh[1004]: Rollback: Could not find upgrade_available variable in bootlo>
Sep 06 11:14:41 localhost systemd[1]: rollback-altboot.service: Main process exited, code=exited,>
Sep 06 11:14:41 localhost systemd[1]: rollback-altboot.service: Failed with result 'exit-code'.