For a comprehensive list of other examples of issues with item positions in the Creative inventory, click here.

All tickets associated with item placement in the Creative inventory are valid for cases introduced in 1.16 and later as per this comment. Exceptions exist, which are valid for their own reasons.

The bug

The vast majority of stone blocks are all grouped together in the Creative inventory, specifically at the top of Building Blocks. The dripstone block is a type of stone block as is clearly stated by its name and natural occurrence, yet despite this, it appears at the bottom of Building Blocks rather than the top.

How to reproduce

1. Open the Creative inventory
2. Locate Dripstone Block in Building Blocks
3. Locate Calcite in Building Blocks
4. Locate Tuff in Building Blocks
5. Note that there is a considerable distance between these items