Masterpress 1.3.6 is a compatibility release. It resolves an edge case with shared fieldsets not working for MySQL 8 when the fieldset is limited to more than 1 post type or taxonomy or excluding any post types or taxonomies.
MEOW_FieldSet :: is_editable()
Checks whether or not this field set is editable for the current user, based on the current user’s capabilities. This method is used internally by MasterPress, but may also be useful for more advanced theme scenarios.