CSV Product Upload to Sales Channel: Sometimes not receiving product create + update webhooks

[cmark]

Expecting Shopify product/create and product/update webhooks to come in when a Product Import CSV is uploaded to a Sales Channel. We only sporadically receive them, resulting in products in our app being out of sync.

The CSVs are being uploaded via a 3rd party Shopify app called "Products Sync Master", could that affect the reliability of the webhook firing? 

We have attempted to resubscribe to the product webhooks to no avail. Searching for a fix so product webhooks are triggered correctly.

Thanks

[cmark]

Following up on this. The issue is continuing to persist, would like any advice on how to remedy this problem. We are not receiving product update or create webhooks, leading to newly added variants not appearing on products, amongst other issues. 

For additional context:

these bulk product updates can be for up to 10k+ plus products at a time. Is there an upper limit of how many webhooks that Shopify can deliver within a timeframe? 

Our webhook handler has/can handle a volume exceeding 10k within a minute, so we do not believe the missed webhooks are occuring there.