Moving portlets and then adding a new portlet leads to incorrect portlet structure

*Might* be a race condition, if you're acting faster than the backend. Please first check, that this isn't the root cause.

Looking forward to hear what causes this.

I thought this at first as well, but even if moving super slowly, this is reproducible but inconsistent.

Ok, found the issue, please see 🐛 Not filling out required portlet third party configuration form elements leads to invisible form error, when moving portlets on the homebox personalization page Active for more information.