I tested all available platforms:
offscreen, kms, linuxfb, minimal:
(myApp:22797): Gtk-WARNING **: cannot open display: :0
(myApp:22797): Gtk-WARNING **: cannot open display: :0
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kms:
pci id for fd 7: 80ee:beef, driver (null)
No protocol specified
pci id for fd 7: 80ee:beef, driver (null)
No protocol specified
pci id for fd 9: 80ee:beef, driver (null)
pci id for fd 9: 80ee:beef, driver (null)
No protocol specified
pci id for fd 9: 80ee:beef, driver (null)
No protocol specified
pci id for fd 10: 80ee:beef, driver (null)
pci id for fd 10: 80ee:beef, driver (null)
No protocol specified
pci id for fd 10: 80ee:beef, driver (null)
No protocol specified
pci id for fd 11: 80ee:beef, driver (null)
pci id for fd 11: 80ee:beef, driver (null)
No protocol specified
pci id for fd 11: 80ee:beef, driver (null)
08:42:58.322 [Warning] Could not initialize EGL display
08:42:58.322 [Error] EGL error
Aborted (core dumped)
pci id for fd 7: 80ee:beef, driver (null)
No protocol specified
pci id for fd 7: 80ee:beef, driver (null)
No protocol specified
pci id for fd 9: 80ee:beef, driver (null)
pci id for fd 9: 80ee:beef, driver (null)
No protocol specified
pci id for fd 9: 80ee:beef, driver (null)
No protocol specified
pci id for fd 10: 80ee:beef, driver (null)
pci id for fd 10: 80ee:beef, driver (null)
No protocol specified
pci id for fd 10: 80ee:beef, driver (null)
No protocol specified
pci id for fd 11: 80ee:beef, driver (null)
pci id for fd 11: 80ee:beef, driver (null)
No protocol specified
pci id for fd 11: 80ee:beef, driver (null)
08:42:58.322 [Warning] Could not initialize EGL display
08:42:58.322 [Error] EGL error
Aborted (core dumped)
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xcb:
No protocol specified
08:44:35.494 [Error] QXcbConnection: Could not connect to display :0
Aborted (core dumped)
No protocol specified
08:44:35.494 [Error] QXcbConnection: Could not connect to display :0
Aborted (core dumped)
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