I have some questions regarding webhook calls triggered when comments are made on Instagram posts associated with a Facebook page:
Despite the Facebook page being linked to the Instagram account, there are instances where comments on Instagram posts are not being integrated into the Facebook page's inbox. Are there any possible reasons for this issue other than a high volume of comments?
Is it the case that webhook calls are not functioning at all for Instagram pro accounts with over 500,000 followers?

I am currently implementing a feature in an app that uses the Meta API to automatically send DMs in response to comments on Instagram posts. The mechanism involves using webhook calls triggered when comments are made on Instagram posts linked to a Facebook page. However, there is currently an issue where some Instagram accounts are not receiving these webhook calls.
Some of these accounts were previously receiving webhook calls as expected, but suddenly stopped receiving them. During this time, there have been no changes made to the settings of the Instagram accounts or the associated Facebook pages.
Is there currently an issue with webhook calls in the Meta API, or has such an issue been reported? Alternatively, is it possible that the settings of the Instagram accounts or Facebook pages could be causing the webhook calls to not be received?