I tried with fields available in the upstream, so it can not be reproduced with vanilla up-to-date- copy.

We have defined that one. It is like our teams with the company. When new bug is created for example maps team, herald automatically sets the right person/team for the bug.

phabricator 51f8ec4487be02e290b1182a7cd5b4069fe7d49f (Tue, Sep 20) arcanist 9e82ef979e8148c43b9b8439025d505b1219e213 (Thu, Aug 25) phutil fa6519f4cea1c059bd381c20971cac413cc4760e (Thu, Sep 15)