Angular MARC Batch Import/Export template for acquisitions record loads doesn't recognize record match sets

Web client 3.5, browser: both Chrome (Version 86.0.4240.111 (Official Build) (64-bit)) and Firefox (81.0.2 (64-bit))

Case:
Loading a file of cataloged items from a vendor to match existing bib records and items and overlay the acq item information based on lineitem detail ID.

Procedure
Set up the load as:
Record type: Acquisitions
Record match set: our defined match set of Matchpoint, using 020 and 024 as matches. This was set up as a biblio match set type.
Holdings import Profile: our defined profile that uses subfield n to match the lineitem detail ID.

What happens:
Record match set field will not populate with our Matchpoint set or any set. The list of match sets does not display. If the record type were Bibliographic records, we'd see our full list of match sets.
Attempt to load the vendor's cataloging hangs and never really starts.

What we expect:
In 3.1 and in XUL, we are able to use the record match sets for either bibliographic or acquisitions loads. We expect the same functionality in 3.5.

The record match set types are biblio and authority in 3.1, and biblio, serial, and authority in 3.5.