Me and my friend were messing around in the end using structure blocks and I copied the Max size of it of the End Pillars and the ender Dragon and loaded it and...

The ender dragon stopped

Couldn't interact with block but could place and break

Other player looks frozen

No lag

Server-side lag?

Portals didn't work

Floating end crystals

Can't break crystals

Commands don't work

When going into survival you can still fly and not take damage but still shows bars

Crashes soon after

Some of the pillars had one side textures and looked very weird

I think that's may be all