Hello!
It seems that the Cormoss Thingwall has no way to be ported to as I get the message "There is no space by the destination" all the time:
https://imgur.com/a/D6dRG5p
I believe the problem is in the place of the Thingwall and lack of any land around it:
https://imgur.com/wpYqj6j
Can you add a few tiles of land around it for using that Thingwall or allow to port in a shallow water?