I cannot find this mentioned anywhere, so perhaps this has always been the case, but when one disembarks on land with no shallow water tiles adjacent, you need to turn on swimming to reembark.
When you initially disembark it displays the message 'You need to turn swimming on', and displays that again when you wish to reembark but prevents you. You can still interact with the boat, taking out it's contents and I assume destroy it. It blocks movement when jutting onto land ie: my character is definitely able to 'touch' it. I have tried coming up to shore in multiple orientations and places, but I believe it wishes to move my character to the centre of the boat before I enter which would require swimming.
A very minor inconvenience, but accidentally leaving swimming on can lead to death.