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Unlink invalid user names, refs 3278 #3595
Jan 12, 2019
The sandbox has an old (9c19d87, see Special:Version) version. Composer hasn't updated  the sha1 ref (see the bottom which says 9c19d87...) hence the sandbox is outdated and doesn't have the submitted changes (same with the recurring events).
No updates could be related to Github's webhook changes "Note: GitHub Services are being deprecated. Please contact your integrator for more information on how to migrate or replace a service with webhooks or GitHub Apps" [1, 2], I tried to add it but have insufficient rights [0, 3]. Maybe @JeroenDeDauw could give it a go?