Draft CLDR 45 release note (https://cldr.unicode.org/index/downloads/cldr-45) reads:
```
Migration
Changes to parentLocales require upgrading implementations that use that element. In particular, they need to support the new nonlikelyScript value, and use the appropriate explicit inheritance for each type of inheritance. The v44 list of locales that inherit directly from root is retained for this release, but will disappear in the future. So implementations should move as quickly as possible to support the new value.
```
Although the removal won't happen immediately, this logic must be implemented in CLDRConverter (for resource bundle chaining) and CLDRLocaleProviderAdapter (runtime locale fallback).