I am experiencing several bugs with Syntax searches In Logos 6.0b beta 4.
A Syntax search does not display any matching verses. Here is a simple example with a single search term in the Lexham Syntactic Greek New Testament:

When I run the search, here is what is displayed:

As you can see, it correctly finds 5 verses, but does not display a list of verses.
I tried changing to the Opentext Greek New Testament, but the Search window does not even give me the opportunity to design a search:

All of this worked great in Logos 5, even in various beta versions.