checkboxes not working in editable trees
In 5.8 there is no problem.
In current code (as of 2021-01-20):
In Parties action, the Contact mechanisms view is an editable tree by default. Used a fresh database.
In this tree the check box for invoice usage is not editable, and does not show the correct information from the database. The form view still works as expected.
I discovered this while working on #9991 (closed), stock module extending the party.contact_mechanism and associated views. I have tested with and without the stock module and the result is the same.
I do not have the know-how to debug this.