https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=37226

            Bug ID: 37226
           Summary: Authority hierarchy tree broken when a child
                    (narrower) term appears under more than one parent
                    (greater) term
 Change sponsored?: ---
           Product: Koha
           Version: Main
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5 - low
         Component: MARC Authority data support
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]

Created attachment 168314
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=168314&action=edit
short screen recording that shows the bug in action

With AuthDisplayHierarchy enabled and the following MARC21 authority data:

001 1
151 $a Europe
551 $a Athens
    $w h
    $9 3
942 $a GEOGR_NAME

001 2
151 $a Greece
551 $a Athens
    $w h
    $9 3
942 $a GEOGR_NAME

001 3
151 $a Athens
551 $a Europe
    $w g
    $9 1
551 $a Greece
    $w g
    $9 2
942 $a GEOGR_NAME

In the authority details page for 'Athens' (authid=3), clicking on the
expand/collapse arrows next to the top-level terms in the hierarchy tree
('Europe' and 'Greece') will not work properly, i.e. *only one* broader
term will show 'Athens' as its narrower term at any given time.

I attach a small screen recording that shows this in action.

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