[FS#681] Prefix Delegation is Broken (both ULA-Prefix and DHCPv6-PD Prefix)

[LEDE Bugs]

The following task has a new comment added:

FS#681 - Prefix Delegation is Broken (both ULA-Prefix and DHCPv6-PD Prefix)
User who did this - Arjen de Korte (arjendekorte)

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Rather than using ifconfig and grep, could you post the output of

    ip -6 addr show dev en0

Could it be that you have configured IPv6 on to be both stateful and stateless at the same time? In that case, what you're seeing makes perfect sense.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=681#comment2321