When adding a GraphPatterns.filterNotExists to an empty GraphPatterns.and() when rendering the FILTER NOT EXISTS is lost

[seakayone]

Current Behavior

GraphPatterns.and()
.and(
  GraphPatterns.filterNotExists(
   iri("http://example").isA(iri("http://example/Class"))
).getQueryString()

renders
"{ <http://example> a <http://example/Class> . }"

The problem is that the FILTER NOT EXISTS clause is lost.

Expected Behavior

GraphPatterns.and()
.and(
  GraphPatterns.filterNotExists(
   iri("http://example").isA(iri("http://example/Class"))
).getQueryString()

renders
"{ FILTER NOT EXISTS { <http://example> a <http://example/Class> . }"

Steps To Reproduce

See above , I have pushed some example test to my fork: https://github.com/seakayone/rdf4j/pull/1/files

Version

commit fe9c6d5 (at the time of reporting it is main HEAD)

Are you interested in contributing a solution yourself?

Yes

Anything else?

No response

[seakayone]

I have opened a bugfix PR: #5562