Shriekers are not chests but they still have their own tabs, I think this is a bug

I'm going to close this issue now that 0.8.0 is released because it is fixed. Feel free to reopen this if you can reproduce the issue using 0.7.0 or 0.8.0.

What version of InventoryTabs are you using? This should've been fixed in 0.7.0