Can't place tar extractor in regular Shipwrecked PE at all, also fish farms will not place if it is initially red - one must sail away and try until it's green. Additionally, fish farm was placed directly on top of another farm, rendering both useless. No mods of any kind.
Create tar extractor and attempt to place in Shipwrecked PE. Create fish farm in same and attempt to place after it initially shows as not able to place.