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This part of the release note of Npcap 0.992 is ambiguous at best:

Remove installer interface option "Support 802.1Q VLAN tag when capturing and sending data," which was unsupported for three years. Support may be restored in future releases, but the option has not had any effect in earlier installers.

You could contact the Npcap developers to find out what the status of VLAN tag capture actually is.