After using the Seaworthy during the day and reaching your SW world, the rest of the day may be shrouded in darkness even when the day counter reads that there is still some daylight to be had. Sunlight returns when noon rolls by. The same effect can also occur when exiting the caves. This has only been tested on an RoG/SW world.
Steps to Reproduce
I was using the Seaworthy to reach the SW part of my save and was greeted by darkness upon arrival. This bug may have a chance of occurring when Spring rolls by.
This issue has not been confirmed by a developer yet.