Linux: "Cannot Connect to QML Emulation Layer" error with Qt6 projects

Tested with 4.1 snapshot from online staging (Built on Mar 20 2023 19:02:32)

• Open DS
• Create/open a Qt6 project
• -> "Cannot Connect to QML Emulation Layer" error seen as in attached picture. 
• -> Clicking OK won't help, cannot work with the project
• Running qml2puppet in qt6_qtdesignstudio_reduced_version/bin outputs:

  • ./qml2puppet-4.1.0 --test
    QML debugging is enabled. Only use this in a safe environment.
    Info: Starting QML Puppet ((null):0, (null))
    Info: Could not load the Qt platform plugin "xcb" in "" even though it was found. ((null):0, (null))
    Fatal: This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.Available platform plugins are: minimalegl, vnc, linuxfb, minimal, xcb, eglfs, vkkhrdisplay, offscreen.
     ((null):0, (null))
    Aborted (core dumped) 

• Opening / working with Qt5 projects work fine