I think the issue is that CDP on trunked interfaces are tagged.
"CDP, VTP, and PAgP updates are always forwarded on trunks with a VLAN 1 tag. This is the case even if VLAN 1 has been cleared from the trunks and is not the native VLAN. Clearing VLAN 1 for user data has no impact on control plane traffic that is still sent using VLAN 1."
An easy way to get round this is to create a subinterface with tag one on either side - enable CDP on this and everything should work.
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