Limits of Subworkflows & Loops
Shopify has recently started allowing some stores to create up to 2,000 variants per product.
To support this change Arigato has put in some safeguards to ensure the stability and performance of the application.
Workflow are limited to sending 250 objects to a subworkflow/loop.
If you run into the error "Unable to send more than 250 items to the subworkflow" it is recommended to use a Bulk Operation for processing.
For example, you could setup a Product Variant Bulk Operation to run a workflow against 2,000 variants on a product.