Added originBehavior() method call with default value of 'select' if not set in settings array (line 28)
3-4 src/Collections/Collection::makeModelFromContract():
Added origin_behavior key and corresponding value to the $source->settings array (lines 73-74)
Once https://github.com/statamic/cms/pull/6983 is merged and released this will need added to eloquent.
Before merge we should also update the minimum Statamic core version in composer.json