I'm currently using faithful 32 textures. However, even using vanilla/default textures, the placeholder textures are still visible. So, it is not a bug caused by texture packs.
happens when typing on phone too.
technically they can simply because farmland is a transparent block, so light can pass through it. therefore, path blocks and glass works the same. other than that, all waterloggable blocks will let light pass through, meaning that it is completely normal for dirt to turn into grass if under them.
@BlinkSteel25 That is something interesting