Hello,
I was searching for "Protect" using the admin search (Moodle 3.11, also my MoodleCloud 4.1.*) and noticed the search failed to list the "Manage blocks" page (/admin/blocks.php), even though one of the column headings features the setting "Protect instances". I then searched for "instances" and also did not see the Manage blocks page on the list of hits.
This looks like a bug to me? Or are column headings (any other fields?) deliberately filtered out from admin searches?
Kind regards,
Przemek