Adding reference field to subtable causes it to convert to a multireference

Wappler Version: 5.4.0
Operating System: Windows 11
Server Model: node.js
Database Type: postgres
Hosting Type: local docker

Expected behavior

Reference field is added and table stays as a subtable.

Actual behavior

Subtable becomes a multireference table and the reference field is hidden or removed.

How to reproduce

See video. Added bonus: you get to see the schema issues I repeatedly encounter.