Thanks guys, cant believe it's been two years since I last checked up on this post. I will have to check up on the policy to see if we still have unkown-tcp traffic hitting the policy.
I know this is an old thread but just to tie the knot on this, there was a bug ID assigned for this issue (PAN-60414) and the fix for it was released on v7.1.13 and later versions/releases. https://docs.paloaltonetworks.com/pan-os/7-1/pan-os-release-notes/pan-os-7-1-addressed-issues/pan-os... Also, the content update (version 8164) has modified HL7 app-ID for recategorization.
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