[FS#349] mwan3 is broken with virtual ifaces

[LEDE Bugs]

The following task has a new comment added:

FS#349 - mwan3 is broken with virtual ifaces
User who did this - Felix Fietkau (nbd)

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Please report it here: https://github.com/openwrt/packages
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=349#comment1101