Cowboy parse_qs only returning first value

PROBLEM - parse_qs should return a list of all variables according to documentation, but only returns the first one.

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I am not sure what the problem is, though when I do quick test then i see that cow_qs:parse_qs/1 does return a list of all found name/value pairs:

(zotonic@PoToi)1> cow_qs:parse_qs(<<"a=1&a=2">>).
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Help everyone help you by providing code that we can check out, compile, and run to see the issue.