Some biomes roof has netherrack instead the biome specfic blocks for those biomes. Such as
Soul sand valley, Basalt deltas
See comparison from bedrock to Java
Unfortunately, The website won't allow me to put the picture for this problem
To repeat this bug go to theses biomes on both platforms
Java and Bedrock and look at those roof of it. And you see what I mean
PLEASE FIXX
Thank you for your report!
We're actually already tracking this issue at MCPE-69159 and MCPE-79608, 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 tickets 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