In Minecraft Bedrock, leaves that are covered on all sides turn off their transparency to emulate a "bushier" look. The textures used for covered leaves are actually within the default leaves textures themselves, not separate ones like with the opaque textures. The game uses the alpha channels in .tga files to determine when the background should or shouldn't be displayed. However, azalea, flowering azalea and cherry leaves use regular .png textures, making the game use a fully black background when they're covered. mangrove leaves on the other hand, use the correct file type but with the incorrect color within the texture, which isn't as noticeable due to it being darker by default.

Steps to Reproduce:

1. Enable the "Next Major Update" experimental toggle (Step not necessary on Preview);
2. Place cherry/azalea/flowering azalea leaves on the ground;
3. Cover it on all sides using more leaves of the same type;
4. Get closer to it and observe.

Observed Results:
The inner leaves have a fully black background, which clashes hard with the soft pink coloring.

Expected Results:
The backgrounds for covered azalea, flowering azalea, cherry and mangrove leaves use the darkest shade in the texture's own palette, similar to the other leaves.

Screenshots/Videos attached: Yes

Notes: Changes to the mangrove leaves would also apply to its opaque texture due to MCPE-170516. While it is also affected, it's very difficult to observe in a normal environment so the reproduction steps don't mention it.