Problem with LV_COLOR_DEPTH = 8 and Codeblocks project

Hello, I have downloaded the pc_simulator_win_codeblocks repository and compiled the project under Windows 10.

Everything is fine so far if I compile it with LV_COLOR_DEPTH = 16 or LV_COLOR_DEPTH = 32, but I want to simulate a project with a smaller MCU and LV_COLOR_DEPTH = 8. It works without problems with a real platform, but after compilation and executing I get just a white screen.

What could be a reason for such a behavior?