I have a Nintendo Switch and Amazon Fire both with their respective versions of Bedrock Edition in them, and this happens in both. When a Drowned is holding a fishing pole it will throw a trident that does 6 damage (3 full hearts). It happens frequently, and should be easily recreated.
Linked issues
Comments 3
Thank you for taking the time to report this on the bugtracker. However, we're already tracking this issue as MCPE-40288. You can leave a vote if you feel like it on that ticket. If you haven't already, try out the search feature for if you report another bug👍.
Thank you for your report!
We're already tracking this issue at MCPE-40288, 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: 📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki
I've had the same thing happen, once it was holding a trident and it changed to a fishing pole while being able to throw it. And another it was naturally spawned like that. Here is a video link to me recording it: https://streamable.com/o0ks7
I'm playing Minecraft Windows 10 Edition on a laptop.