problem with tags in hierarchy

[frederic chaume]

Hi all

I have a strange behavior with the hierarchical tags

I wanted to set a tag externaly in DXO and then expecting to see it in 
Digikam (using DK 7.10 under windows 10) with the correct hierarchy but 
I that wasn't the case in DK
So I did  the same with 2 tags in 2 different hierarchy and I see a 
different result depending on the tag I used.
In one case the tag is well presented in its hierarchy in DK (seen in 
the caption) but for the other it is presented as a flat list

when I check the XMP the <lr:hierarchicalSubject> is consistent as well 
as the <dc:subject>, but in the <digiKam:TagsList> I see only the 
hierachical tag which is correctly presented  but not the one which is 
presented as a flat list

I can share off line the XMP file

in the settings / metadata/ advanced / tag the order is the following :  
dc.subject, then  digikam.Taglists, microsoftphoto, 
lr.hierarchicalSubject, mediapor, acdsee, IPTC.application, 
exifimage.Xpkeywords


thanks for your help

Frederic