SPARQL: BIND + EXISTS not working on RDFLib 6.1.1

[JMGrenhas]

Hi! The following query does not work.

select * where {
  ?s a owl:DatatypeProperty .
  BIND( EXISTS {?s a owl:FunctionalProperty} AS ?f)
}

Results on an «Exception: What do I do with this CompValue? <...>»
Note: it works on GraphDB.
Thank You

[aucampia]

I think this maybe related to #1472

[JMGrenhas]

Yes, seems to be the same thing. Someone may close my issue if appropriate.
RDFLib is superb, but the necessity on context would simplify the use of it, would be very nice! The use case appears in examples on sites like stackoverflow.com. SPARQL is great, indeed, but some necessities are a too much big challenge...

[aucampia]

Closing this in favor of #1472 of which it is a duplicate. There is also a PR to fix this here #1794 - any reviews are welcome.