Comment 8 for bug 1024367

It has been a while but I think I figured out the conditions for this problem to occur. This problem appears to affect all objects using Palette, owned by a house using a team color that is not in the first half of the [Colors] list (rounded down in case the total count is an odd number). With vanilla game [Colors] list and player color setup this would mean that green, blue and light blue player colors are affected.

Moving all colors available as player colors, used on singleplayer maps as well as the one used by neutral houses (LightGrey) to the top of the list and ensuring that there's enough colors on the list after them (adding dummy color entries where necessary) is an effective mitigation for modders to use for the time being.