Bonjour Arnaud,
Merci for your input:
Both moodle/course:view &
moodle/course:viewparticipants are set to: Allow
That's is why I feel it makes very little sense that the student can only see normal editing teacher (and other none-admin standard roles) - but if you create a new role, the student cannot see the newly created role despite that it is a legacy role of a 'standard-role'.
Roles and permissions
Only students are added to the participant list??
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