It's been a thing for mooooonths (or a year?) despite not being an issue before, and I'm not sure if it's to do with Element or #KDE/#Kwallet (or something else entirely i.e. #Flatpak). The last time I had an issue relating to Kwallet was with #VSCode and even that required some weird workaround (IIRC, lying that we're using #GNOME 's keychain or smtg like that).
I've been using #NeoChat but I swear Element's the best #Matrix client and I miss having it.
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edit: omfg, a workaround was found apparently since I last looked into this a ~year ago. Adding
org.kde.kwalletd6 to its 'Session Bus' list (i.e. through #Flatseal) works! I can happily use Element again!!! 🥳🔗 https://github.com/flathub/im.riot.Riot/issues/528#issuecomment-2984156871



