GraphDB history and versioning plugin weird behaviour

Question

Trying to go through the guide to use the plugin it looks like the filter behaviour looks inconsistent. After the three steps:

1. Inserting data

    INSERT DATA { <urn:Kirk> <urn:dateOfBirth> "2233-03-22"^^<http://www.w3.org/2001/XMLSchema#date> .}

2. Adding a filter

    INSERT DATA { [] <http://www.ontotext.com/at/addFilters> "* * !LITERAL *" }

3. Attempting to add data (that don't pass the filter)

    INSERT DATA { <urn:Kirk> <urn:dateOfBirth> "2633-03-22"^^<http://www.w3.org/2001/XMLSchema#date> .}

a query over the whole history (SELECT ?dateOfBirth { ?log a hist:history ...) correctly contains only the "2233-03-22"^^xsd:date", but a query to get a snapshot of data at some timestamp (SELECT ?dateOfBirth FROM <http://www.ontotext.com/at/20220712161717> { ... }) *does return both "2233-03-22"^^xsd:date" and "2633-03-22"^^xsd:date".

A bug, or do I miss anything?