Sometimes always "1 new event"

[bonny]

Sometimes the green bar comes up and says "1 new event". It only happens sometimes. Find out why and fix!

Reported for example here:
https://wordpress.org/support/topic/keep-getting-blank-event/

[bonny]

After some research I think this is happening on sites with MariaDB 10.6.12 (and possible others).

After installing a local test site with MariaDB the click on "+1 similar events" does not open anything.

On another test site I got access to there was strange grouping of similar events, some recent events got mixed with some really old.

Needs more investigation, but at least now I can reproduce it locally.

[frompton]

Can confirm seeing it on a site with
mysql Ver 15.1 Distrib 10.11.3-MariaDB, for debian-linux-gnu (x86_64) using EditLine wrapper