Worm position marker arrow uses wrong palette colours

(Up to Tricks and glitches (first generation))

In some older builds of WinUAE the red marker that falls from the top of the screen after a few seconds of inactivity to indicate the current worm's position more often than not appears to use different colours from the game palette. Often it appears yellow with a tan highlight.

This does not appear in WinUAE 2.0.1 at the very least.