I add Facebook Comments plugin to site. All things work good, beside third level comments. Adding one results in "Ups". Checking source endpoint https://www.facebook.com/plugins/comments/async/createReply/855097689715793/?av=100040254370273 response with 500: "Sorry, something went wrong. We're working on getting this fixed as soon as we can."

Anyone know what cause this error?

Site: https://anime24.ambient-galaxy.dev/news/anime/3628/rezero-trzeci-sezon-wysoko-ocenianego-anime-ma-termin-premiery