I used the clear all unreads shortcut (shift + esc) and it doesn’t go away…
Edit: For anyone having this problem, I’m using GNOME desktop environment and clearing the notifications on the shell removes the bubble on the app icon. Thanks to @EmasXP for the hint.
Thanks, a previous reply hinted at this as well and it worked. It’s a shame it doesn’t sync, I used discord and other apps and they all sync properly. I edited my post accordingly.