Colorblind bug in spectator mode

When spectating with colorblind mode OFF, some of the purple team shows up as red (outlines, health bars, map icons) and some shows up as purple, even when colorblind mode is OFF. If you enable colorblind mode then disable it, it correctly paints everything red then everything purple when switched off again.

This happened in 4.18 and now currently in 4.19. I play on the Mac client.