ember-changeset@v3 and ember-bootstrap haven't played well together cause one was using tracked properties (ember-changeset) and the other one was still using computed properties (ember-bootstrap). Faced some compatibility issues between both of them. Especially with computed properties that depend on state derived from a tracked property.
I added a hack in #19, which was using internal APIs of ember-changeset to work-a-round that issue. This seems to not working anymore with latest ember-changeset / ember-changeset-validations versions.