Hello.
It is not a bug, but it is indeed a tricky part of the melee bots to understand.
When a melee bot is in front of a foe or a box, wait or move, it will auto-attack. Run the same exact order you did and here is what happens:
- boxer moves for 3 sec (and is now in range of the box)
- while it is waiting, it is attacking the box
- box is destroyed, bot becomes in range of the laser tower that shoots
- it can survive the first shot, so you will notice that by the time box is destroyed you are still in the 10 seconds wait range, it will wait for the shots to come
For instance if you move 2 or 2.5 seconds you are not in melee range of the box, and bot will wait without attacking. To sum things up, WAIT order does not mean you don't attack, just that you don't move forward.
By the way, this is one of the first "hard" levels ;)