I have encountered this as well. I run PE bedrock on a android S9 to play with a friend who runs bedrock on a xbox 360. We have never encountered it in worlds I create but we have encountered it in every world he creates. The first one (sand) was visible to him as well as me. The second (dirt) grew before my eyes but was not visible to my friend on xbox. Hitting the blocks (not breaking, just tapping like to create a path block) with my shovel caused the glitch to extend/grow. I tapped it until it had expanded from 5 blocks to approximately 30 in a vertical stack. He could only see the five until the next time we loaded the world. Then he was able to see it as well.
I have encountered this as well. I run PE bedrock on a android S9 to play with a friend who runs bedrock on a xbox 360. We have never encountered it in worlds I create but we have encountered it in every world he creates. The first one (sand) was visible to him as well as me. The second (dirt) grew before my eyes but was not visible to my friend on xbox. Hitting the blocks (not breaking, just tapping like to create a path block) with my shovel caused the glitch to extend/grow. I tapped it until it had expanded from 5 blocks to approximately 30 in a vertical stack. He could only see the five until the next time we loaded the world. Then he was able to see it as well.