The video bellow shows skeletons spawning and falling into a water stream causing them to take damage. Mobs should not take fall damage like this. From my experience this does not affect players but i do hear the fall crunch sound when I fall into shallow water but no damage tick.
Thank you for your report!
We're tracking this issue in MCPE-173094, 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