In 1.20.2 pre1, the search functionality of the recipe book was changed:

The search will only match the beginning of any word in the item's name.
For example, searching for "tor" will still show Torch and Redstone Torch but not Daylight Detector anymore

However, it appears like the new search interpets any non-alphabetic character as a space. This does not make sense for languages that are written in a non-latin script or use special chars (aka, most non-English languages).

Examples

• In Chinese or Japanese, since they don't use the Latin script, nothing shows up in the search anymore as soon as you type anything in the search bar.
• In German, when searching for words including special chars, for example "Gemeißelt" (chiseled), nothing shows up anymore.
• Similarly, in French, when searching for "chêne" (oak), nothing shows up.