Minecraft graphic bugging on launcher

So .. I played with my friend LAN World and I came up with one design that was related to the banner .. for some reason the banner was invisible to me .. Even my friend didn't see it ...

Bug

I was in a survival, I found a mineshaft where I broke 2 spawners and apparently there was an error and there were many particles where the spawner block was, I guess someone else can pass. This was translated from Spanish into English just in case...