Gravel bloc drops only flint in 20w06a

It's a minor bug with the iron and diamond shovels

What I expected to happen was...:
broke a gravel with my diamond shovel

What actually happened was...:
The gravel drop only flint

Steps to Reproduce:
1. broke gravel. (Use only diamond and iron shovel without silk touch. The stone , netherite , gold and wood shovels work fine.)