Cypher script generated by apoc.export.cypher.all leaves the temporary `UNIQUE IMPORT ID REL` relationship properties

Guidelines

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Expected Behavior (Mandatory)

When executing the cypher script, I expect the temporary UNIQUE IMPORT ID REL relationship properties to be removed, as is done for the similar UNIQUE IMPORT ID node properties.

Actual Behavior (Mandatory)

All created relationships have an unwanted UNIQUE IMPORT ID REL property.

How to Reproduce the Problem

Simple Dataset (where it's possibile)

This tiny dataset is sufficient:

CREATE (n:DummyNode)-[r:DUMMYREL]->(m:OtherDummy)

Steps (Mandatory)

Select a database with some data (the exact data is unimportant).

Export as cypher, with the multipleRelationshipsWithType option set to true:

CALL apoc.export.cypher.all(null, {format: 'cypher-shell', multipleRelationshipsWithType: true})

Check the resulting cypher statements. Example:

:begin
CREATE CONSTRAINT UNIQUE_IMPORT_NAME FOR (node:`UNIQUE IMPORT LABEL`) REQUIRE (node.`UNIQUE IMPORT ID`) IS UNIQUE;
:commit
CALL db.awaitIndexes(300);
:begin
UNWIND [{_id:1, properties:{}}] AS row
CREATE (n:`UNIQUE IMPORT LABEL`{`UNIQUE IMPORT ID`: row._id}) SET n += row.properties SET n:OtherDummy;
UNWIND [{_id:0, properties:{}}] AS row
CREATE (n:`UNIQUE IMPORT LABEL`{`UNIQUE IMPORT ID`: row._id}) SET n += row.properties SET n:DummyNode;
:commit
:begin
UNWIND [{start: {_id:0}, id: 0, end: {_id:1}, properties:{}}] AS row
MATCH (start:`UNIQUE IMPORT LABEL`{`UNIQUE IMPORT ID`: row.start._id})
MATCH (end:`UNIQUE IMPORT LABEL`{`UNIQUE IMPORT ID`: row.end._id})
CREATE (start)-[r:DUMMYREL{`UNIQUE IMPORT ID REL`:row.id}]->(end) SET r += row.properties;
:commit
:begin
MATCH (n:`UNIQUE IMPORT LABEL`)  WITH n LIMIT 20000 REMOVE n:`UNIQUE IMPORT LABEL` REMOVE n.`UNIQUE IMPORT ID`;
:commit
:begin
DROP CONSTRAINT UNIQUE_IMPORT_NAME;
:commit

Note that the UNIQUE IMPORT ID node properties are removed at the end, but not the UNIQUE IMPORT ID REL relationship properties.

neo4j / apoc