If I right click on an instance of the "Relative Clause" tag in the Lexham Syntactic Greek New Testament (SGNT) and select Search This Resource, I get 0 matches.
But if I select instead Search All Open Resources, I get matches in the SGNT.
I think the bug here is that the search does not work for Bible search but it works if I change the search to Basic Search. The search that the Search This Resource creates is <SGNTClause = Relative Clause>. If I change this to Basic Search, then I get the expected matches.