When I clicked "Main menu" button on the death message and after reopened the world I found that my position was under the world and I caught another death message "[player] fell out from the world".

Steps to reproduce:

1. Cause death in any way
2. Click "Main menu" button on death screen
3. Open the world again
4. You will find that you fell out from the world

Following video shows the bug: https://drive.google.com/file/d/19DMI_Mm0CfcMA3jHPYTxJyRNQASsYr5b/view?usp=sharing

(Video has been uploaded to Google Drive as it exceeds max size permitted on this resource)