Describe the bug
Some wall items introduced in v3.0 are in the wrong creative tab. They are in the "Building Blocks" tab.

To Reproduce
Steps to reproduce the behavior:

1. Open the creative tab.
2. Check at the bottom of the "Building Blocks" tab.

Expected behavior
They should be in the "Decoration Blocks" tab like every other wall item.

Thanks for the report!

This bug has been fixed for the next version.