Almost all tree types turn moss under the tree to dirt when they grow. The only exceptions are acacia (that won't grow on moss) and the 2x2 spruce (the moss stays moss). This bug was tested on both an smp and on a private creative world.
MCPE-165706
Most Trees turn moss to dirt
Resolved
Duplicate
0
Tis4Truth
(Unassigned)
Unconfirmed
Windows
1.19.51
Retrieved
Thank you for your report!
We're tracking this issue in MCPE-126849, 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