I'm not seeing an obvious error in the configuration. In situations like these I like to start at one end and follow the flow.
Is there packet ingress at the RAD
Can you see that arrive on the MX using monitor interface ae0.49
Does that egress on the MX port sub interface face the EX
Is there ingress on the EX port ae0.0
Does that egress on EX port ge-1/0/2.0
If one of these these fails we start there. If the packet flow is present, then we need to confirm the inner tag swaps are occuring.