The Needs Review Queue Bot → tested this issue. It either no longer applies to Drupal core, or fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".
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I recently ran into this issue. When
Drupal.detachBehaviors()is called with an empty context, it will numerous issues. Any JS implementing a detach will remove everything that it did in attach. For example, any autcomplete UX added bycore/misc/autocomplete.js.I created the MR with the 1 line fix.
The attached static patch can be used for composer builds and applies to both 11.x and 10.3.x+. - 🇩🇪Germany mxh Offenburg
This issue is rather old but interestingly I also ran into this issue the last couple of days. In my case I'm just returning a
MessageCommandas Ajax response. When no message is already existing on the page, this bug occurs.