`r IN relationships(path)` fails with `unknown type of agtype container 1610612736`

[YGY-001]

Environment

Apache AGE 1.8.0
PostgreSQL 18.6
Docker image: apache/age:release_PG18_1.8.0

Reproduction

LOAD 'age';
SET search_path = ag_catalog, public;

SELECT ag_catalog.create_graph('age_issue_case15');

SELECT *
FROM ag_catalog.cypher('age_issue_case15', $$
CREATE (a:L)-[:R]->(b)
$$) AS (v agtype);

SELECT *
FROM ag_catalog.cypher('age_issue_case15', $$
MATCH ()-[r0]->()
MATCH p0 = (:L)-[:R]->()
RETURN r0 IN relationships(p0) AS member
$$) AS (member agtype);

Expected

The query returns:
member

true

Actual

ERROR: unknown type of agtype container 1610612736
The following controls succeed:
MATCH p0 = (:L)-[:R]->()
RETURN relationships(p0)
MATCH ()-[r0]->()
RETURN r0 IN [r0] AS member