On MAC OS this Icons are painted with fmx in color, by Default.
For windwos there is a bug-fix like described here:
It would be nice to have this adjustment also on your version of FMX.Canvas.D2D.pas
Sorry, but how D2D Canvas related to FmxLinux ?
Yes, sorry, you are right.
But perhaps it is even possible to reach that on Linux with an technique, that on this platform is offered?
I've just checked - on Ubuntu 16.04 they look ok - but not colored. But we can't handle this - it depends on Linux version i guess.