I don’t know how to report this. However the firefox snap has an issue when interacting with the mozc keyboard for japanese. It will not allow me to enter japanese characters see : https://askubuntu.com/questions/1536660/japanese-input-not-working-in-firefox-ubuntu-24-04-1/1536692#1536692
I am not sure where to report this to maybe have it looked at. However it’s a very frustrating issue for people that need to switch keyboards. I have had to install the deb version of firefox to work around it.