Video here:
It's possible the dragon just started to move which caused the player to get hit. However, the player is below the dragon, it certainly isn't going in the player's direction and the player doesn't even seem to be touching the dragon.
As far as I'm aware, the dragon launching you so high up is also part of this bug as this wasn't present in older versions and doesn't correlate with the dragons movements as you'd expect it to.
This bug seems to have been around for a while and has in my experience been a fairly consistent issue.
Linked issues
duplicates 1
Comments 1
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-105770, which is a report that has not been resolved yet.
If you want, you can upvote the parent ticket, and enable watching to receive any updates about it - if you believe you have any information that may be important for this issue, please leave a comment on the parent. Please also use the search function in the future to prevent duplicate reports.
Quick Links:
📓 Issue Guidelines – 🛠 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki
💬 Mojira Subreddit – 💬 Mojira Discord