Same problem here. This was one of my favorite features (in lieu of polymorphism or the ability to create relations to multiple different entity types) as it allowed us to simplify display of different entities in the same place.
Our use case:
In our projects, we hire both individual subcontracters (Person-type) and vendors (Company-type) to fill in certain roles in projects. Sometimes, they are hired for similar things, but the “Role” they fill has overlaps, but isn’t the same. So the Person-type has a “Role or Type” field with a multi-select, while the Company-type has a “Role or Type” field with a multi-select, but they are different multi-selects with different options. Previously, these were displayed in the same column (elegant), but now they are side-by-side (inconvenient)