Steps to reproduce:
- Open any random item with at least one entity-type statement, like this one.
- Edit an entity-type statement.
- Remove focus from the main snak entity selector, e. g. by clicking elsewhere in the document or adding a qualifier or reference.
The main snak entity selector text field turns red (ui-entityselector-input-unrecognized class) as soon as it loses focus, even though I haven’t edited it at all and I’ll still be able to save the edited statement as soon as I make any other change (e. g. edit qualifiers or references). The same thing happens to other entity selectors as soon as they’ve had focus at least once – e. g., in a statement with an entity-type qualifier or reference, if you focus that text field and then the main snak text field again, the qualifier/reference text field will now be red too.