Manjaro 26.0 authentication window flickers and disappears

hello together,
using dolphin and mounting a device needs an authentification/legitimation, also kde-partitionmanager.
Since my last update to Manjaro 26.0 Anh-Linh, i have encountered the following problem:
the legitimation window shortly appears and flickers and then disappears.
There is no chance to legitimate.
In Manjaro 25.9 both in x11 and wayland everything was seamless. Kernel is LTS 6.1.159-1
and GPU is according to screenfetch AMD Radeon RX 570 Series (radeonsi, polaris10, ACO, DRM 3.49, 6.1.153-1-MANJARO).
I have no idea, so i went back to manjaro 25.9 thanks to clonezilla.
Sorry i have no error logs.
Any ideas?
Thank you

Looks like the infamous Polkit issue. Check the stable update announcement - top of the second post.

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Unfortunately, because you have done that, any help forum members may be able to provide is now limited to pointing you toward the Update Announcement threads.

Thanks to the update announcements especially from soundofthunder, Teo and plinkr the latest update was successful.
Thank you very much.

set permissions:
permissions

mask polkit-agent-helper
mask

Use Linux 6.6 or 6.12.

Using a temporary workaround as a permanent measure is likely to cause is really nasty issues at a later point.

Don’t do that - yet again - you are the system administrator - remember that when you next update relies on the service you masked.

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