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.
A bug occurred while I tried to break a ladder. One of my people was on that tile of the ladder when it was destroyed and it freaked out. The character bugged out for a sec them appeared where the ladder went to before I got rid of making me make the ladder again to get him down. Could be annoying if its a giant ladder and would make you rebuild the whole thing.