How to remove cases?

[Sem0733]

Ey,

Since this new update cases all look new (and ugly), but I can't remove them. This is what it keeps on saying when I attempt to:

"You don't have permission to create a double-chest shop."

How do I get rid of cases? And why aren't normal cases a thing anymore. Hopefully this is gonna get sorted out soon otherwise I'm outta here.

Bye.

 

[RaVo]

You can try using a newer minecraft version, if you arent using 1.13 already. I also get the popup, you dont have permission to create a double-chest shop allot but me chest do not look wierd.