In my recent world(2nd Turn of Tides world), MacTusks hut spawned at the edge of the forest biome and the sea causing MacTusk to spawn at sea. This ables him to run on water where he is unreachable while he relentlessly hit you with blowdarts.
Steps to Reproduce
Generate turn of tides world, open map and see if MacTusk hut spawned at the edge.
This issue has been fixed in either a future version or updated in a previous version.