/v1/me/tracks/contains does not include redirects

[wolfgang_bures]

When I want to check if tracks returned from a album-search are in the users library I will not find tracks the user liked with a "redirect"/"linked_from".

For example song: 3VMrCNlgBs15p4Wo7Dtwr6 is returned from the spotify app,

getting this track in the users context (market=AT) returns a redirect to 2u5SOijSaIyf7xSnogPdHC. This will also be the ID I find when I search the album for tracks.

But checking the users liked files at /v1/me/tracks/contains only return true for 3VMrCNlgBs15p4Wo7Dtwr6 and I have NO WAY to get from 2u5SOijSaIyf7xSnogPdHC to 3VMrCNlgBs15p4Wo7Dtwr6!

Expected behaviour would be to return TRUE for BOTH IDs.