Since MCPE-162421 was resolved 2 years ago, and this bug being slightly different, I am reporting this as a new issue
I found an old map and noticed some parts of the grass were displayed as black instead of green. When I attempted to reload the chunks and also make new maps, the blocks would remain black. However, when placing a block on top and destroying it, it fixes that one block, however this is tedious.
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Please attach a copy of the world where this issue occurs. If it's too large to attach, you can upload it to a file-sharing site like OneDrive or Dropbox and share the download link.
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On Windows you can use the Export world feature.
On Android or iOS you need to use a file explorer to navigate to Device storage > games > com.mojang > minecraftWorlds
On Xbox or Switch the only way is to upload it to a Realm, and then download the world on Windows 10 or Android/iOS. (Please do not purchase a Realms subscription just to provide a world to us - but if you have a Realm already this may be a viable option if you wish to do so.)
On PlayStation you can follow these steps to copy a world save:
Make sure your BLANK USB stick has been formatted to FAT32
On your PlayStation, go to Settings > Application Saved Data Management > Saved Data in System Storage > Copy to USB Storage Device > Select Minecraft > Select Saved World to copy > Copy
This should then copy the world save to the USB, which you can share to a file sharing site such as OneDrive, and then share the link.
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