Pardon interruption ... but ... moodle 3.11 appears to be a version still under development.
From git acquired 3.11 code the version.php file says:
$release = '3.11dev (Build: 20201224)';// Human-friendly version name
$branch = '311'; // This version's branch.
$maturity = MATURITY_ALPHA; // This version's maturity level.
However, to suggest ... is there still a temp directory at:
/var/moodledata/tempdir/backup/restore_5feb2c25823bb
From command line go to that directory and see what's there with focus on a users.xml file. The xml files are roadmaps and text. One could edit with a text editor. Is there an admin level user in the course backup? Normal course restores have issues if an admin level user exist in the course ... roles conflicts. The CLI I don't think can sort that out.
Truth in attempting to assist .. don't have a 3.11dev site running and thus never actually tried doing what you are attempting.
'SoS', Ken