Strange Port VLAN ID Mismatch on Nexus 5672 after upgrading to NX-OS 7.1(0)N1(1)

Dear all,
I'm currently in the process of configuring two Nexus 5672 Switches for our Network. I connected one of the switches to our catalyst 3750 Core using trunks on each side. Everything worked just fine - the link came up and I was able to manage the Nexus using the SVI I created in VLAN1.
However, after upgrading the Nexus 5672 from NX-OS 7.0(2)N1(1) to 7.1(0)N1(1), the connection between the Nexus and the Catalyst 3750 is broken - the corresponding port on the Nexus (eth 1/1) is blocked by STP due to a Port VLAN ID mismatch and it chooses itself to be the root bridge:
sw-5672-01# show spanning-tree
VLAN0001
  Spanning tree enabled protocol rstp
  Root ID    Priority    32769
             Address     8c60.4f1b.9181
             This bridge is the root
             Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec
  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     8c60.4f1b.9181
             Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec
Interface        Role Sts Cost      Prio.Nbr Type
Eth1/1           Desg BKN*4         128.129  P2p Peer(STP) *PVID_Inc
Eth2/1           Desg FWD 1         128.257  P2p
sw-5672-01# show spanning-tree detail
 Port 129 (Ethernet1/1) of VLAN0001 is broken  (Port VLAN ID Mismatch)
   Port path cost 4, Port priority 128, Port Identifier 128.129
   Designated root has priority 24577, address 000d.bce9.2b00
   Designated bridge has priority 32769, address 8c60.4f1b.9181
   Designated port id is 128.129, designated path cost 4
   Timers: message age 0, forward delay 14, hold 0
   Number of transitions to forwarding state: 1
   Link type is point-to-point by default, Peer is STP
   BPDU: sent 164, received 309
However, the trunks on both switches are configured with the same values and I don't see any problem here:
Trunk Port on the nexus switch:
sw-5672-01# show interface ethernet 1/1 switchport
Name: Ethernet1/1
  Switchport: Enabled
  Switchport Monitor: Not enabled
  Operational Mode: trunk
  Access Mode VLAN: 1 (default)
  Trunking Native Mode VLAN: 1 (default)
  Trunking VLANs Allowed: 1-4094
  Voice VLAN: none
  Extended Trust State : not trusted [COS = 0]
  Administrative private-vlan primary host-association: none
  Administrative private-vlan secondary host-association: none
  Administrative private-vlan primary mapping: none
  Administrative private-vlan secondary mapping: none
  Administrative private-vlan trunk native VLAN: none
  Administrative private-vlan trunk encapsulation: dot1q
  Administrative private-vlan trunk normal VLANs: none
  Administrative private-vlan trunk private VLANs: none
  Operational private-vlan: none
  Unknown unicast blocked: disabled
  Unknown multicast blocked: disabled
Trunk port on the 3750 switch:
sw-3750-01# show interfaces gigabitEthernet 3/0/1 switchport
Name: Gi3/0/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: trunk
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: dot1q
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none
When downgrading the Nexus 5672 back to NX-OS 7.0(2)N1(1) the connection is fine again, interface eth 1/1 on the Nexus switch is not blocked anymore and chooses the correct root bridge (which is the 3750):
sw-5672-01# show spanning-tree
VLAN0001
  Spanning tree enabled protocol rstp
  Root ID    Priority    24577
             Address     000d.bce9.2b00
             Cost        4
             Port        129 (Ethernet1/1)
             Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec
  Bridge ID  Priority    32769  (priority 32768 sys-id-ext 1)
             Address     8c60.4f1b.9181
             Hello Time  2  sec  Max Age 20 sec  Forward Delay 15 sec
Interface        Role Sts Cost      Prio.Nbr Type
Eth1/1           Root FWD 4         128.129  P2p Peer(STP)
Eth2/1           Desg FWD 1         128.257  P2p
I've also read through the Release Notes for NX-OS 7.1(0)N1(1) and haven't found anything that sounds suspicous. Do you think this might be a bug or could it also be another problem?
Thanks
Michael

Thank you - an additional indication that this is a bug indeed. I'm trying 7.1(0)N1(1a) today, if it doesn't work either I'll downgrade to NX-OS Release 7.NX-OS Release 7.0(5)N1(1a) which is the recommend Version to use anyway. I'll post the results here.
I'll also check with our distributor how we can inform Cisco about a potential bug.

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