Version v1.1b-1232, Steam, keyboard/mouse
I'm completely stuck. The game registers movement, but doesn't move in any direction (starts "swimming" animation instead of idle animation). I was swimming to the right and entered the rock roughly where the arrow is drawn. I was able to move around within the circled area for a moment but then got stuck in the position I'm in. Although the character appears slightly above the rock, the position is where the X is drawn at the top of the rock. The character can only be angled directly down or to the bottom right (as shown in screenshot) - pressing up or left will cause a swimming animation, but facing down only.
I couldn't move at all and I needed to restart the day, losing my progress. I don't have a video.
The location is to the right of the Se Pulu cave, between the fast travel location and offering site.