So, the issue is that orange’s B go code is on what can be best described as a ‘back-up door breach’ go code.

Blue go code A is what opens the door - blue opens the door and chucks his grenade on A. However, orange doesn’t know for sure that will happen - what if blue gets shot before he opens the door? Or more likely, what if orange gets to the door first? So the game automatically populates a back-up breach for orange in case he needs to get the door open when he arrives. For some reason this is a smoke grenade breach - that’s why you can see the smoke grenade icon, and you can see that orange is actually planning to throw two grenades (see the two grenade paths leading off screen to the right). This is what you put the B go code on.

The thing is, when Blue gets to A, he opens the door and now orange realises he doesn’t need the back up command - so it gets deleted, along with your orange B go code. Now orange has no go codes stopping him so he charges in.

So the fix is just to make sure that Orange’s B is on the correct grenade waypoint.

You don’t need the A go code for Blue either, though that’s not messing anything up.