When I try to look at deleted revisions of a page, for example https://nl.wikipedia.org/w/index.php?title=Gebruiker:Victordeguide&action=edit&redlink=1 I get:
[WXZUuwpAEKsAAFRi1EoAAAAA] 2017-07-24 20:12:43: Fatale fout van type "BadMethodCallException"
Asking around, a fellow checkuser got the same error, a moderator could just see them.
On nlwiki we have a different setup with CU's as they are not moderators. This works weil, but it can be handy to see deleted pages, so the checkuser right is extended with rights to view deleted pages.
Seems that something changed not effecting moderators with full rights, but does effect checkusers.