[FS#991] untagged vlan do not work on mt7620

[LEDE Bugs]

The following task has a new comment added:

FS#991 - untagged vlan do not work on mt7620
User who did this - Alex Maclean (eamaclean)

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I can confirm there's an issue here - PVID is not correctly set. In your case, you've configured VLAN 5, but PVID will get set to 3 (the VLAN group ID). VLAN 3 should work for you.

This seems to be a uci and/or luci issue, depending on how you look at it. Some drivers fix it up.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=991#comment3363