[FS#3454] Netgear WNDR3800 VLAN switch broken 19.07.4

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Daniel F. Dickinson (danielfdickinson) 

Attached to Project - OpenWrt/LEDE Project
Summary - Netgear WNDR3800 VLAN switch broken 19.07.4
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - openwrt-19.07
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on
 - Software versions of OpenWrt/LEDE release, packages, etc.
 - Steps to reproduce
   

 With the latest release of OpenWrt (19.07.4) using a VLAN > 16 fails.  It's rather strange as this was a problem years ago with the RTL8366s switch on these devices. I verified the firmware is reporting itself as 19.07.4 (I wondered if the files got mixed up and I was using some 18.xx version due to issues with the download site, but that is not the case).

As long as the VLAN/VID are below 16 everything works properly, but for a VLAN > 16 (regardless of whether one keeps the VLAN