May be Bug #946383 is the same.
I am not sure but this Bug #839319 could also be related to this problem.
Regards
Achim
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https://bugs.launchpad.net/bugs/937238
Title:
music collection
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: unity-lens-music (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/937238
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https://bugs.launchpad.net/bugs/937238
Title:
music collection not shown in lens
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