Same issue with the flatpak version on Archlinux hyprland:
Here is the error log:
[3:0113/235531.231252:ERROR:browser_main_loop.cc(283)] Gtk: gtk_widget_get_scale_factor: assertion 'GTK_IS_WIDGET (widget)' failed (node:3) UnhandledPromiseRejectionWarning: DBusError: org.freedesktop.DBus.Error.ServiceUnknown at g.flags.r._methodReturnHandlers.<computed> (/app/lib/sh.cider.genten/resources/app.asar/.vite/build/mpris-D94cwka-.js:10:1612) at h (/app/lib/sh.cider.genten/resources/app.asar/.vite/build/mpris-D94cwka-.js:9:752) at EventEmitter.<anonymous> (/app/lib/sh.cider.genten/resources/app.asar/.vite/build/mpris-D94cwka-.js:9:1391) at EventEmitter.emit (node:events:518:28) at /app/lib/sh.cider.genten/resources/app.asar/.vite/build/mpris-D94cwka-.js:20:5379 at Socket.<anonymous> (/app/lib/sh.cider.genten/resources/app.asar/.vite/build/mpris-D94cwka-.js:10:24695) at Socket.emit (node:events:518:28) at emitReadable_ (node:internal/streams/readable:834:12) at processTicksAndRejections (node:internal/process/task_queues:81:21) (node:3) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1) [@ciderapp/genten] Error reading accent-color [ 'Requested setting not found' ]