CMD_CYCLE_OPEN for multiple ports

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I am using CMD_CYCLE_OPEN to make fwknopd play nice with nftables,
like so:

CMD_CYCLE_TIMER     30s
CMD_CYCLE_OPEN      /usr/sbin/nft add element inet filter fwknop_allow { $IP . $PROTO . $PORT timeout 30s expires 30s }
CMD_CYCLE_CLOSE     __NONE__

and for a single port this works fine.
But if I use -A tcp/22,udp/60000 or similar the open command is only run for the first port i.e. tcp/22.
I was expecting CMD_CYCLE_OPEN to be executed once for every port in the protocol/port list.

Using -T it looks like it sends the list correctly
Message String: <redacted ip>,tcp/22,udp/60000

The server is running fwknopd 2.6.10