Steps to Reproduce:
1. Create a new World in languages other than English. For example, I used Simplified Chinese.

2. Open your Inventory, then check the name of the new 1.20 items' translation.

Result:
You can easily find that they aren't translated as the way before the items were moved out the experimental features. The items lost ther localization, they are still in English, instead of Chinese that I expected to appear.

Expected Result:
They're translated, like the way before they were moved out the experimental features.

The bug was found in 1.20.0.21&22.

This bug is already fixed.