Add folder screen freezes in Debian virtual machine

[Frigbog]

Currently running Flacon 8.2.0 in a virtual machine on Debian 10 via Flatpak. The issue was seen in earlier versions of Flacon as well.
When I try to add a folder a folder selection window appears but there is no way you can select a folder. The window completely freezes an the only thing you can do is kill the application.
This behavior is not seen in a physical machine running Debian 11, it's working well in this setup.
Is there anything that can be done to troubleshoot the issue?

[SokoloffA]

Flatpack turned out to be a rather problematic format. Perhaps your problem is described in the issue.
Often problems with Flatpack are solved by granting full access to the disk. Please, try it and write it helped or not.

P.S.
I'll try to reproduce your problem.

[Frigbog]

The issue seems to be reproducible. I installed a new vm with Debian 10.11 and KDE, the same problem occurs. Granting Flacon full access to the file system does not solve the problem.
System:
Debian 10.11 kernel release 4.19.0-18-amd64
KDE Plasma 5.14.5
KDE Frameworks 5.54.0
Flatpak 1.2.5

As mentioned before, it works on a Debian 11 system. I cannot upgrade the Debian 10 system due to other application dependencies.

[SokoloffA]

I'm an idiot, instead of "Add folder" I checked "Add disc". After I read your message carefully I was able to reproduce the problem.

I done some tests:

• I installed Debian 10 + KDE in the VirtualBox
• Build flatpak-portal-test-de (see instructions on https://invent.kde.org/libraries/xdg-portal-test-kde/-/tree/master)
• Run flatpak run org.kde.portal-test-kde
• As result "Open directory (modal)" dialog freezes

So it's not a bug in the Flacon, it's a bug in Flatpak runtime. I also found a message about such a problem

P.S.
I am currently installing Debian 11 to test on it

[Frigbog]

I noticed you put up Flacon version 8.3.0 in your repo. I upgraded and everything is working now! It must definitely have something to do with flatpak.

[SokoloffA]

I upgraded and everything is working now!

Have you updated Falcon or have you updated Debian?

[Frigbog]

On Debian 10: I uninstalled the flatpak version of Flacon. I had already configured the Flacon repo list (for earlier versions of Flacon). Then I upgraded the Debian system and I noticed there was a new Flacon version available. So I installed this directly on the local file system and itś working.