To reproduce.

1. Go to any quiz (to pick just one relevant example).
2. Do Administration -> Check permissions for any user.

Expected result: moodle/site:viewuseridentity capability is listed, because it affects what can be seen in the quiz reports, or log report.

Actual result: permisisons for that capability is not shown.

Because this affects the logs report, it is relevant to all contexts, so it probably needs to be fixed in context_module::get_capabilities. I guess all the context_XXX classes should be reviewed at the same time.

The following capabilities should similarly be overridable in activity contexts:

• moodle/site:accessallgroups
• moodle/site:viewfullnames
• moodle/site:trustcontent

Having just worked on MDL-63818 and MDL-63772, I now see that the right fix is to just change the capability definition to say 'contextlevel' => CONTEXT_MODULE, for these caps, then they will show up when overriding permissions in system, course cat, course or module contexts.