BUG: Incomplete output KG when quoting TMs with multiple POMs

[arenas-guerrero-julian]

What Happens?

When quoting a triples map that has multiple predicate object maps, the output KG does not contain all the quoted triples.

To Reproduce

The following mapping only generates the triples for one on the predicate object maps within the quoted triples maps:

@prefix rr: <http://www.w3.org/ns/r2rml#> .
@prefix rml: <http://semweb.mmlab.be/ns/rml#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix ql: <http://semweb.mmlab.be/ns/ql#> .
@prefix ex: <http://example/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix : <http://example.org/> .
@base <http://example.org/> .

:firstTM a rr:TriplesMap ;
    rml:logicalSource [
        rml:source "test/rml-star/RMLSTARTC004a/data.csv";
        rml:referenceFormulation ql:CSV
    ];
    rml:subjectMap [
        rr:template "http://example/{c1}"
    ];
    rr:predicateObjectMap [
        rr:predicate ex:p1 ;
        rml:objectMap [
            rr:template "http://example/{c2}"
        ]
    ];
    rr:predicateObjectMap [
        rr:predicate ex:p2 ;
        rml:objectMap [
            rr:template "http://example/{c2}"
        ]
    ] .

:secondTM a rr:TriplesMap ;
    rml:logicalSource [
        rml:source "test/rml-star/RMLSTARTC004a/data.csv";
        rml:referenceFormulation ql:CSV
    ];
    rml:subjectMap [
        rr:template "http://example/{c3}"
    ];
    rr:predicateObjectMap [
        rr:predicate ex:q1 ;
        rml:objectMap [
            rml:quotedTriplesMap :firstTM
        ]
    ];
    rr:predicateObjectMap [
        rr:predicate ex:q2 ;
        rml:objectMap [
            rml:quotedTriplesMap :firstTM
        ]
    ] .

:thirdTM a rr:TriplesMap ;
    rml:logicalSource [
        rml:source "test/rml-star/RMLSTARTC004a/data.csv";
        rml:referenceFormulation ql:CSV
    ];
    rml:subjectMap [
        rml:quotedTriplesMap :secondTM
    ];
    rr:predicateObjectMap [
        rr:predicate ex:r ;
        rml:objectMap [
            rr:template "http://example/{c4}"
        ]
    ] .

CSV data:

c1,c2,c3,c4
s,o,a,z

This is because RML-star is not normalized at this moment (converting TMs with several POMs to TMs with only one POM), just RML is normalized.