When I create a new world with caves and cliffs features enabled, none of the "old" Mines generate like how they would in a none caves and cliffs (features enabled) world. There are no mines that I can enter from the surface and get my early gameplay coal or iron from.
Thank you for your report!
We're tracking this issue in MCPE-121708, 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