A friend and I have completed the MOTD easter egg twice now and both times neither of us got the challenge complete. We did both ways to finish the easter egg, where weasel would kill the other members and where weasel would die. The challenge would pop but give us 0 xp and in the UEM challenge screen it says we need to do it.

The map is great but having completed the easter egg twice now and the challenge doesn't complete kinda killed the map.