Exiting a boat using the "leave boat" button while having a villager in the back causes you to punch. This punch hits the villager, as the villager is moved to the center of the boat where the player exits from. This issue causes iron golems to attack and villager prices to be raised.
Thank you for your report!
We're actually already tracking this issue at MCPE-78113, so I will resolve and link this ticket 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