Summary: Minecraft Bedrock has the old Dirt Texture because if you go on Minecraft Java and place Dirt and Grass you can see the new Dirt Texture from 1.14 on the Grass and applied to the Dirt however on Minecraft Bedrock the Grass Texture is updated to the New Dirt Texture but the New Dirt Texture isn't applied to the Dirt.

Steps to Reproduce:
Step 1: Get Dirt on Minecraft Java and Bedrock.
Step 2: Place the Dirt.
Step 3: Compare Dirt Textures.

Observed Result: Minecraft Bedrock has the outdated Dirt Texture.

Expected Result: The Dirt Texture should be updated to match Minecraft Java's