Sometimes when opening a chest while going through a portal and if you manage to open the chest it stays open and can't be accesable till you quit and and start the game
Check the video link below screenshot doesn't really help
https://imgur.com/gallery/IxfHAfU
Thank you for your report!
We're actually already tracking this issue at MCPE-53530, 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 – ✍️ Feedback and Suggestions – 📖 Game Wiki