PATCH with multiple INSERT statements do not add all data

When sending the following PATCH request:

INSERT DATA {
  <https://drive.verborgh.org/solid/card#me> <http://xmlns.com/foaf/0.1/name> "Ruben1"
}
;
INSERT DATA {
  <https://drive.verborgh.org/solid/card#me> <http://xmlns.com/foaf/0.1/name> "Ruben2"
}
;
INSERT DATA {
  <https://drive.verborgh.org/solid/card#me> <http://xmlns.com/foaf/0.1/name> "Ruben3"
}
;
INSERT DATA {
  <https://drive.verborgh.org/solid/card#me> <http://xmlns.com/foaf/0.1/name> "Ruben4"
}
;
INSERT DATA {
  <https://drive.verborgh.org/solid/card#me> <http://xmlns.com/foaf/0.1/name> "Ruben5"
}
;
INSERT DATA {
  <https://drive.verborgh.org/solid/card#me> <http://xmlns.com/foaf/0.1/name> "Ruben6"
}

only some of those statements are added. A possible result is:

@prefix : <#>.
@prefix n0: <http://xmlns.com/foaf/0.1/>.

:me n0:name "Ruben1", "Ruben3", "Ruben6".

Reproduce the PATCH request shown in the issue with all six INSERT DATA statements and inspect the resulting Turtle data. Trace the request handling and update processing until you find where statements are dropped; done means all six name values are stored and the behavior is covered by a regression test.