Flags emoji stopped showing on Bluesky in Firefox on Windows 11

Flags emoji are not supported system-wide in Windows, but Firefox does show them fine. This used to work in Bluesky web application as well, but few days ago, something changed and flags don't show anymore. Anyone knows what happened? Firefox still shows flags just fine, just not in Bluesky.

https://preview.redd.it/zro49hfq0o4f1.png?width=637&format=png&auto=webp&s=0742eab7767dd0c16890426224cf8c4a2db7724c