[FS#612] WAN to LAN leakage on MT7620 devices

[LEDE Bugs]

The following task has a new comment added:

FS#612 - WAN to LAN leakage on MT7620 devices
User who did this - Kristian Evensen (kristrev)

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This bug is probably related to FS#103, which was fixed with commit 566de813c318d6d30ec3645ee46d3e7357e49f5e. However, this fix does not seem to work for me on the devices I am testing.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=612#comment2123