I agree with ww. It's true the MX just forwards BPDU's when they arrive on the native VLAN (unless drop untagged is turned on BAD FEATURE). However if you have a different native VLAN or access port in a different VLAN that BPDU will not be forwarded on. The MX would however receive BPDU's from the root through Dist 2 but on a different VLAN.
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