https://en.wikipedia.org/wiki/Special:Notifications says I have only 45 notifications, which is way too small.
Also, it only goes back to 9 May 2016, whereas alerts shows 9mo (9 months old).
My personal account (which this refers to) is Mattflaschen.
With no-JS, there are 482 (determined by checking the number of .mw-echo-notification), going back to 3 May 2013.
(Also, if I set the paging to 500, there are only 372 on the first page. Not sure why, maybe canRender).
Confirmed in betalabs - the issue appears for a user with more than 100 notificaitons. Also, no-JS is more correct - old messages will show if you change the pagination to 500 (may be not exactly all of them).
e.g. There is a big discrepancy between count in db for user Etonkovidova and what's displayed in enwiki:
[enwiki]> select count(*) from echo_notification where notification_user in (select user_id from user where user_name='Etonkovidova'); +----------+ | count(*) | +----------+ | 1394 | +----------+
Only 100 will be listed on Special:Notifications in enwiki.
This should be [partially] fixed by https://gerrit.wikimedia.org/r/#/c/300951/
It should give access to all non-deleted notifications but the numbers in the pagination widget ("notifications 51-100") may be off.
Checked the fix in 1.28.0-alpha (86ffeb1) - taking into account the pagination problems due to notificaitons from moderated topics, all notifications are displayed correctly.