1.32+1.33 bug White player is treated as observer

This is a critical bug for player in slot 22, traditionally the white player, where they will get counted as an observer for some ingame functions like private chat and resource trading, as well as having the observer version of the UI displayed. At the time of writing, other high-number slots aren’t known to suffer from this bug.

To test this, you need at least two people in melee: the host always takes the first slot, then in melee maps they will have to add 20 computers to fill slots up to 21, then the second person joins into slot 22.
In custom maps with fixed slots, this is easier to test because you can just switch to the slot of choice