We started receiving webhooks for Instagram comments again. Some people affected from this issue also reported it being solved for them on the Facebook Bug Report page. Facebook has not commented on the resolution yet, therefore we will keep monitoring the situation for a few hours, before declaring the incident resolved.
Posted Nov 11, 2021 - 01:49 PST
Facebook updated the bug report, acknowledging the issue, and saying that most probably this issue is caused by changing privacy/permissions on the affected Instagram pages. They were not specific about what privacy/permissions might have changed.