Shopify’s Product Count API caps at 10,000. Use pagination, GraphQL, or webhooks to get an accurate count. Maintain a local cache for efficiency.
I believe the productsCount query previously did have a 10K limit, but this was removed.
Did you try with 2025-01 version?
Some troubleshooting tips here too: Shopify GraphQL API productsCount query not working - #2 by Daniel_Ablestar