Linphone 5.2.1 only shows a grey square, nothing happens

Hello,

When I run Linphone-5.2.1.AppImage, I got only a grey square in the middle
of the screen, and nothing else happens.

The terminal shows this error:

$ ./Linphone-5.2.0.AppImage --verbose
> QML debugging is enabled. Only use this in a safe environment.
> Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use
> QT_QPA_PLATFORM=wayland to run on Wayland anyway.
> [13:55:04:835][Info]Core:linphone: QT: app/App.cpp:315: "Starting Linphone
> (bin: linphone)"
> [13:55:04:835][Info]Core:linphone: QT: app/App.cpp:316: "Use locale: pt_BR
> with language: Portuguese"
> [13:55:04:836][Info]Core:linphone: QT: app/App.cpp:317: "System timezone:
> code=30 / country=Brasil / Offset=-10800 / ID=America/Sao_Paulo"
> [13:55:04:841][Info]Core:linphone: QT: :0: "Running secondary app success.
> Kill it now."
> [13:55:04:841][Info]Core:linphone: QT: app/App.cpp:331: "Destroying app..."


What is happening?
How to fix it?

P.S.: no, I can't update it to newer versions because I'm on AlmaLinux
8.10! The prerequisites por newer versions (glibc 2.29) cannot be met.

Cordialmente,

Anderson <https://lattes.cnpq.br/3143751824580975> Lima
<https://linkedin.com/in/limanderson>, analista de TI;

Suporte EaD e SIGAA;

UNIFEI <https://unifei.edu.br/> campus Itajubá.

Atendimentos se iniciam em https://dti.unifei.edu.br/suporte/ .

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