Unable to filter legacy tasks by --reserved-resource filter

Version
pulpcore-3.63.1
pulp-rpm-3.27.2
pulp-container-2.22.0

Describe the bug
Following migration from pulpcore-3.49 to pulpcore-3.63, we are unable to filter legacy tasks (those created while running on 3.49) with --reserved-resource filter. Neither HREF or PRN argument works.

To Reproduce

1. install pulpcore-3.49.22, pulp-rpm-3.26.1
2. create some repos with remotes set to Red Hat CDN
3. sync those repos
4. filter tasks with --reserved-resources-record by supplying a sample repo HREF as the arg, SUCCESS!
5. migrate to pulpcore-3.63.1, pulp-rpm-3.27.2 (Pulp migrations executed OK).
6. filter tasks with --reserved-resources and the same arg, no match yielded, FAILURE

Expected behavior
The same result should be presented when using the same arg (provided as HREF) both prior and post Pulp migration. Alternatively, filtering by PRN with new Pulp core should yield the same result set as filtering by HREF in the old Pulp core. Another option would be to write an additional Pulp migration for reserved resources (so that the HREFs there are converted to PRNs), is that feasible? Dunno.

Additional context
Tasks themselves are migrated just fine.

Reproduce the migration from pulpcore-3.49.22 to 3.63.1 using the reported repository sync steps. Compare --reserved-resources-record with --reserved-resources using the same repository HREF, then test the PRN form. Done means legacy tasks return the same expected result after migration, or the migration limitation is documented.