Reproduce: I do not know how to reproduce
Description:I was just walking in my survival world with my friend then I saw it. I have to be in a specific angle to see it, it appears that you can go through it. After leaving and rejoing the game the unknown block dissappeared
BTW I'm not using any mods
Found on my Huawei Y7 2019 on Minecraft pocket edition
You screenshots show that you are using a resource pack or addon. We can only confirm bugs that can be reproduced in vanilla Minecraft.