Collections seem to be syncing fine. Just tested adding a few tags and syncing products and got this:
TypeError: Argument 1 passed to taxonomy_term_save() must be an instance of TaxonomyTerm, instance of stdClass given, called in /app/modules/shopify/includes/shopify.entity.inc on line 434 in taxonomy_term_save() (line 711 of /app/core/modules/taxonomy/taxonomy.module).
Collections seem to be syncing fine. Just tested adding a few tags and syncing products and got this: