Display of user mentions custom avatars on subwiki is conditioned by the type of user who performs the mention

STEPS TO REPRODUCE

1. Login as Admin
2. Set an avatar (upload a picture) on your profile
3. Create an user (U1) and set an avatar for it as well
4. Create a subwiki
5. Create an user on that subwiki (e.g. UL1) and set an avatar for it
6. On subwiki, edit a page in WYSIWYG mode
7. Type @ to display users mention list
8. Login as the local user (UL1)
9. Type @ to display users mention list as well

EXPECTED RESULTS

All users from mentions list have their avatars displayed near their username, regardless if the mention is made by a global or a local user from that subwiki.

ACTUAL RESULTS

The avatars are displayed differently depending if a global or a local user is making the mention.

If the mention is made by a global user, all avatars are displayed, but if the mention is made by a local user, only avatars for him and other local users are displayed.