Version
v3.15.0
Expected Behavior
When setting a relationship to null, you should then be able to set it back to another value.
Actual Behavior
When setting a relationship to null, you are not able to set its value to anything else and it remains set to null.
Steps to reproduce
this.changeset.relationship = this.store.peekRecord('relationship', id); // value is set to the found record.
this.changeset.relationship = null; // value is set to null.
this.changeset.relationship = this.store.peekRecord('relationship', id); // value continues to be set to null