NAT-PMP connections not tracked with nf_conntrack

[Mr Dash Four <mr.dash.four@xxxxxxxxxxxxxx>]

I have configured a personal vpn with NAT-PMP (which extends from my 
local to the remote vpn endpoints), but that connection does not appear 
to be tracked by the nf_conntrack. I see the connection made in netstat, 
but not in nf_conntrack. Is that a bug or is there any other way I can 
track this connection?
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