Tagging the Structured Data on Commons folks since it affects their CI as well (example) :/

This seems to affect different tests, by the way – in the build for the change from the previous comment (console), the failing test is “Lexeme:Forms FormId counter is not decremented when addForm is undone”.

I assume the timeout is in LexemePage.open():

open( lexemeId ) {
    super.openTitle( 'Lexeme:' + lexemeId );
    browser.waitForVisible( this.constructor.LEMMA_WIDGET_SELECTORS.EDIT_BUTTON /* = '.lemma-widget_edit' */ );
    this.addFormLink.waitForVisible(); // last button on page, probably the last
}

And in “FormId counter is not decremented when addForm is undone”, that function is called like this:

const id = browser.call( () => LexemeApi.create().then( ( lexeme ) => lexeme.id ) );

LexemePage.open( id );

I wonder if there’s a race condition here, where we create the lexeme via the API but then the subsequent web request from LexemePage.open() is served from a replica that hasn’t seen the lexeme creation yet? (I think the LexemeApi and LexemePage use separate sessions – at least, LexemeApi logs in using a username/password from the environment while I don’t see any login in LexemePage – so this wouldn’t be prevented by ChronologyProtector.)

Change 537465 had a related patch set uploaded (by Lucas Werkmeister (WMDE); owner: Lucas Werkmeister (WMDE)):
[mediawiki/extensions/WikibaseLexeme@master] selenium: retry LexemePage.open() once

https://gerrit.wikimedia.org/r/537465

Change 537465 merged by jenkins-bot:
[mediawiki/extensions/WikibaseLexeme@master] selenium: retry LexemePage.open() once

https://gerrit.wikimedia.org/r/537465