On multiplayer realm (playing solo)
The game will crash, resulting in a loss of 10-20 minutes of progress.
This gets annoying when I spend 20 minutes building something, the game crashes, then I lose the entire build!
I believe this is related to the massive amount of lag that has gotten progressively worse since 1.17 release!
When 1.17 first released, previously laggy areas (or chunks) seemed cured of lag! Then, the lag started returning, and has become increasingly worse! This seems to happen after almost every DLC release, you fix the lag, then it progressively comes back until the game is unplayable!
Related issues
Comments

Duplicate of MCPE-12347.

Thank you for your report!
We're tracking this issue in MCPE-12347, 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
-- I am a bot. This action was performed automatically! The ticket was resolved by one of our moderators, and I left this message to give more information to you.
Please, report this in REALMS.