What do you see if you perfrom local port-mirror on Ex4200 interface ge-0/1/2? You might also have an MTU problem as the mirrored packets from the EX4550 now have a double 802.1Q header coming into the EX4200, yes? Maybe enable Jumbo frames on EX4550 interface ge-0/0/38 and EX4200 interface ge-0/1/2 - maybe???
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