System Tray in GNOME 48 not working

[Nethshan]

Im using Deluge 2.2.0 Flatpak with the Appindicator and Kstatusnotifier extension (the same one used by default on Ubuntu) on GNOME 48. I have also enabled system tray icon in Deluge's preferences and minimise to tray on close. Unfortunately, it appears to not work. I have other apps that appear on the systray but not this. However, surprisingly, it appears under background apps in the quick settings menu (look at the attachment). While this may be sufficient, it is not intuitive like the system tray extension. Hope this gets fixed.