I created this Syntax search for Future Perfect Periphrastics in the Lexham Syntactic Greek New Testament. The construction must have a future form of εἰμί plus a perfect participle within the same clause.

While my syntax search may have its imperfections, the results were surprising. The results include Revelation 21:6-8, which has the future of εἰμί and the perfect participle in different clauses in different verses.
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When I dug into the clause analysis, I found that everything in Rev 21:6-8 is tagged as part of one big Segnent Clause. In fact, these verses consist of 11 clauses.

What am I missing here? Did the person who tagged this text just get tired in the last few verses of the New Testament and throw everything into one big Segment Clause? This classification seems inconsistent with the rest of the tagging of clauses in this resource. Cascadia Syntax Graphs and OpenText both properly group the words into separate clauses in these verses.
If the clause tagging is this inaccurate, I would do just as well with a simpler Morph search and cull out the false hits.
Thanks for any feedback on what I am missing here.