Can you try to configure VLAN 1 as native on the trunk interfaces?
native-vlan-id 1;
Also please see a note from configuration guide
If you are using Layer 2 switches, you will need to set BPDU options to help prevent
STP misconfigurations that can lead to network outages. First, enable
bypass-non-ip-unicast to allow BPDUs. Next, set the bpdu-vlan-flooding option to
limit flooding of BPDUs to each VLAN; otherwise BPDUs received on one port will
be sent to all other ports even if ports are in different VLANs.
Regards, Wojtek