Using PTP550 as trunk link between Cisco switches

We are using the PTP550s to connect Cisco switches (Series 9000, 2960X) as trunks links. However, not all VLANs work well. Do these PTP550s support the 802.1Q protocol?

When describing a problem, always report firmware's version you're using.
I think that was an ooooold bug with ooooold firmware. I hope...

Hi, I have the same problem, did you found the solution?

Kind regards