[Bug?] only one coop player shows their shirt/pants colors, everyone else's show as white

[Blorgx3]

Was doing some cooperative with a couple friends using the Copper mod (though ive confirmed this happens in vanilla also) and every level load it seemed to randomly select a player to be the special one that gets to show their shirt/pants colors, and everyone else's is forced as white. This is a bug, right? gl_nocolors is off and when it is on it does default colors and not white anyway. All three of us were using the 2021-05-11 build on windows.

Apologies if I left something essential out, I've never submitted a bug report here before and idk what the etiquette is.