Product/update webhook API update requirement

Hi.

I’m having issues updating all the webhooks for the users of my Shopify app. The issue seems to be that when user re-open their store, those old webhooks fire, and they cannot be updated when the store is closed.

If webhooks of the old API version are still firing beyond the April 1st deadline, is my app in danger of being de-listed? Or will those webhooks just no longer fire?

Thanks.