fatal at editing due to cafebabe in facetselect

With only the following type in the only CND:

[docs:alternative] > hippo:facetselect

• docs:description (string)

and only importing the xml for this ( I commented out all the other imports in hippoecm-extension.xml, so no HST imports are in),
I get the following error message, when I press the Edit button to edit the mentioned document type block:

Internal error: no matching property definition found for

{http://www.hippoecm.org/nt/1.2}

related: no matching property definition found for

{http://www.hippoecm.org/nt/1.2}

related

No editing of this document type block is possible.

A workaround is to not use the root uuid 'cafebabe ...' as the default for the facetselect (as given in the xml import for docs:alternative).