FP3+ Q Developer Options simulate color space not working

hi, i use a fairphone 3 plus and installed the beta of android 10 Q yesterday.

everything works find for now except for the color correction in the developer options. it has the option simulate color space - monochromacy . when i activate that option nothing happens. when i go back again to the developer options it is disabled again.
does anyone know a solution for that?

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I’ve got FP3 with the same /e/OS-version and the setting stays activated.
I can however not confirm whether it’s really working (I don’t see any difference in my apps)

everything on your phone should be in black and white only

Then it’s not working at all. App icons for instance are still in color. And calendar too…