The "Banners Cleaned" stat rarely works

No matter how many banners you wash up, the "Banners Cleaned" stat will always show 0

What I expected to happen was...:
The "Banners Cleaned" stat number would increase by 1 each time a banner is washed/cleaned up

What actually happened was...:
The "Banners Cleaned" stat stayed to 0

Steps to Reproduce:
1. Get a water bucket, a cauldron, a crafting table, a banner and some dyes
2. Fill the cauldron with water
3. Put a pattern on the banner using the dyes
4. Make sure to check the Banners Cleaned stat before cleaning the banner.
5. Clean up the banner.
6. Check the Banners Cleaned stat again. The stat will still have the number 0.