It shows the texture if a block is not near that side of the texture it but it's supposed to not show if another glass texture is all ready there.
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They have a random chance depending on the cooldown that they will follow the player. At least thats what i can tell from your post.
Chickens follows player if player holds normal (wheat) seeds. Its not the bug you are talking about, consider playing around more.
This happens on the PC version as well, but i dont see a bug report on it. I assume this is working as intended? (i mean not following melon seeds.)
In the 2rd photo the chicken isn't following the player, it's following the light