Desktop client Flatpak on Gnome invisible window

I am using the Nextcloud Sync Client Flatpak on my Fedora 40, Gnome 46 System, NVIDIA proprietary Driver.
May nextcloud server runs on the AIO docker container.

When opening Nextcloud to check things like ignored files etc. only an invisible windows opens. after opening that again a visible window opens (so two are open).

This does not affect functionality but is annoying I have to open/close it twice every time.

Does anybody experience the same problem or has any idea on how to fix it?

I had the Nextcloud Flatpak as well as the nextcloud-client dnf package on my system and they somehow conflicted.

I removed the nextcloud flatpak.

No everything is working.

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