Window content vanishes when switching between program modules (Linux)

Hello, I experience the following failure on 2 different Computers,
an AMD Desktop with Linux Mint XFCE, NVIDIA 9600 and
an Intel Laptop with Linux Mint Cinnamon and Integrated Intel graphics,

Both Versions 6.02 and 6.04 show this (never happened with 5.x):

SOMETIMES when I switch between Schematic / PCB / 3D by means of the taskbar or the window buttons the appearing window is functional but the drawing space is an empty grey surface !
Nothing is lost ! I can restart KiCad and everything will be fine again.

Up to now I can find no way to provoke this or to reliably redraw without a program restart ?

Has anybody observed something similar

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