Force vendor class in DHCP dissector

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I'm dissecting CableLabs-compliant DHCP. The client messages contain a vendor class identifier (Option 60), so the dissector correctly identifies it as CableLabs and applies the CL dissector to the vendor-specific Option 43 content.

The DHCP server response however, does not set the VCI, although it does set Cablelabs-compliant content in Option 43.

How do I force the dissector to treat the DHCP response as CableLabs vendor?