We've been having this issue for a few months. Orders will send to our expo screen but not the kds screen.
Seemingly at random, some orders will send only to expo and not to the kds. I've been tracking this issue for a couple of months. Originally I though it might be a specific item wasn't configured correctly, but the orders don't have any one shared item across all of them and all of the items will fire on other tickets.
I then thought maybe it was an offline terminal, but the orders can be from online ordering, a handheld, or a stationary terminal. So it really does seem to be a random problem.
Our sister site is having a similar problem and also hasn't been able to find a solution. Has anyone else had this problem and if so how did you solve it?
