Unable to use file dialogs - they close after one second.

To reproduce:
1. Use any web feature that opens file-selection dialog, or use Ctrl+O or Ctrl+S
2. The dialog (typical to Gnome apps) appears for one seconds and disappears
3. Sometimes when the disalog is used to "download a file" I am able to press Enter key quickly and the file is accepted, but that's it. Typically it's not even possible to click any button.

Other than that, there's no crash, no hang or other annoyance.

It happens no matter if I use existing or a new fresh profile or incognito mode (chromium -incognito).

It happens both in XFCE (4.14) and in Plasma (KDE Frameworks 5.71.0).

Chromium version: 96.0.4664.110 stable

Nothing specific appears on the log when the browser is started with (chromium --enable-logging=stderr --v=1). I can share the logs if needed.

Such misfeature of the dialog does not happen in other apps that use the same dialog, e.g. in Firefox.