Whenever I try to build anything under water it take a insanely long time to do so. The Items will say Unreachable when they are 100% reachable it is very annoying as the only way i could make them build was to move them to the tiles over and over until the built and finished building. In the picture below you can see the Water pump and pipes are being said as "Unreachable" even though it clearly is. It is very annoying and needs to be fixed.
Steps to Reproduce
Find a water source a little bit away from your main area build in the water. This should replicate it.
This issue has not been confirmed by a developer yet.