Can you explain in more detail? Is the subject of this ticket was was shown as an error in your browser window? I doubt this is related to varnish and/or "mailbox lag".

@BBlack can you confirm this is unrelated. @matej_suchanek had suggested T175473.

At Wikidata, I tried to change or add value to statements with item datatype, e.g. enter the place of birth a person. The border around the entry field changes colors (depending on whether the value meets constraints or not), but then fails to allow me to save it (cancel or remove are enabled).

It's possible that it's just symptom of more general system issues. On the same day, some pages wouldn't even load.

In T175588#3597261, @Esc3300 wrote:

@matej_suchanek had suggested T175473.

Or T175525.

yeah .. probably the same thing. Hadn't notice that I unfocused it though.

Please see https://www.wikidata.org/w/index.php?title=Wikidata:Contact_the_development_team&oldid=555632537#Can.27t_save

@Esc3300: For future reference, please see https://mediawiki.org/wiki/How_to_report_a_bug - tasks need to include steps how to reproduce a problem. Thanks!

what part is missing?