I can provide more information in case it is helpful to you.
Stripe informs us that errors are happening when trying to send the webhook events: 2 requests had other errors while sending the webhook event.
And they tell us the following: You must send an HTTP response message with a status code between 200 and 299 for Stripe to consider that the webhook event was successfully delivered.
Is it possible that the problem with sending order emails comes from here? Could the Webhook url be incorrect?
Thanks in advance and best regards.