Looking at that now. Deleted comments are not easy to recover. If you haven’t already, please do put in a request using the support contact form and we’ll take a look at each report of missing comments and try to recover them.
Apologies for the trouble! I’m glad your report (and other ones from the contact form) allowed us to catch this early!!
The same thing happened to me. After updating a post, all the comments disappeared. I’ve sent my support contact form as instructed and am fervently hoping the comments can be recovered. *crosses fingers*