After the recent preview removed the all side mushroom pore block, there is no way to get the texture since bedrock doesn't create the texture like java. You cannot call this a parity request now since you removed the only way to get this texture! It is time to fix it instead of removing every request to fix it, please!

Place two brown mushroom blocks or red mushroom blocks next to each other

Then break one and see the texture on the side you broke the block.

Expected (what happens on Java):

The texture is the mushroom pore

Actual (what happens on Bedrock):

The texture is unchanged