Suspected ICU failures in likely subtags in ICU version 76.

[sven-oly]

Likely_subtags testing fails on 2 specific cases in ICU76, but not in ICU75. The problem appears in ICU4C, ICU4J, and NodeJS.

These two test cases are the ones failing across these 3 platforms:
{"test_type": "likely_subtags", "label":"4350","locale":"und-Latn-RS","option":"maximize","hexhash":"9239ec71d862238418d385cc602acd18e22faad6"}

Expected: "sr-Latn-RS" but actually got "en-Latn-RS"

{"test_type": "likely_subtags", "label":"4352","locale":"und-Latn-RS","option":"minimizeFavorRegion","hexhash":"0830bc4596dce4c7e1cbe27a18fbea2ea93c750e"}

Expected: "sr-Latn" but actually got "en-RS"

However ICU4X 2.0 does not have this problem.

This looks like a ICU issue in version 76.1.

[sffc]

If this is a bug in ICU, this bug should be filed in Jira.