On enwiki betalabs go to Special:Block - the required field - Expiration - will be missing:
The Console displays the following:
Uncaught Error: Circular dependency! mw-input-wpExpiry at Object.OO.ui.Element.static.unsafeInfuse at Object.OO.ui.Element.static.infuse at Object.OO.ui.infuse at infuseIfExists