Block X-Forwarded-Host Rule blocking X-Forwarded-For with IPv6 zone index appended

Block X-Forwarded-Host Rule Cloudflare Specials seems to dislike IPv6 addresses with a zone index must be appended to the address, in particular:

fe80::1ff:fe23:4567:890a%17

That 17 being the outgoing network interface.

Is this expected behaviour? Are reverse proxies expected to strip the zone index information?

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