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This not a bug in the Hierarchy Slicer but in Power BI , see the following information from Jan Pieter Posthuma the author of the slicer. The MDX / Dax / Power BI is repeating the parent member in the child level below.
This issue and it is not related to the HierarchySlicer, but how Power BI/DAX and SSAS Multidimension are working together.Somehow the MembersWithData set to NonLeafDataVisible (see: https://docs.microsoft.com/en-us/sql/analysis-services/multidimensional-models/parent-child-dimensio...)
is not respected and the child level is returned to Power BI.
It is related to PowerBI/DAX and SSAS MD. You may reference Jan Pieter Posthuma if more information is needed.
If we look at the following Parent-Child hierarchy in AdventureWorks you see that Brian is only visible at level 03:
But if we retrieve the same hierarchy in Power BI with the HierarchySlicer and the OOB table we see that Brian is returned twice, level 03 and level 04.
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