The sea grass texture is not displaying properly causing the surface of the water texture to vanish. Meanwhile boats don't allow item to be swapped from the inventory, this also happens when not on boat occasionally and has not been fixed since. Please address these issues on the next Hotfix.
Clearly the hot bar is highlighting the sword, but the bow remained equipped no matter how many times the sword is selected.
Thank you for your report!
We're tracking this issue in MCPE-156281 and MCPE-156814, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki