Under certain circumstances, the current code in Drupal.behaviors.OverrideUiBehaviour.processHtmlComments() seems to twist the order of elements and cause a re-ordering, such that for example the title block is displayed at the end of the region instead of the beginning as expected.
This seems to happen only under certain circumstances, which I'm unfortunately unable to identify at this point.
Currently, the identification of the template element in Drupal.behaviors.OverrideUiBehaviour.processHtmlComments() for cases with more than one element inside a comment creates a new <override-mode> which will contain the wrapped template elements. This new element is currently inserted before the closing comment which seems to cause this issue. Instead we can insert it after the opening comment, which seems to fix the issue.
Fixed
1.0
Code
This is really great! Thank you very much Sebastian. I was stuck on that one.
Automatically closed - issue fixed for 2 weeks with no activity.