https://github.com/unicode-org/cldr/blob/main/common/supplemental/likelySubtags.xml has
but I don’t see an entry for "sr_Latn".
Please add an entry for "sr_Latn" → "sr_Latn_RS".
https://cldr-smoke.unicode.org/spec/main/ldml/tr35.html#Likely_Subtags
The data doesn’t list all possible combinations. Instead, it does a fallback and substitution. So the matching line is:
<likelySubtag from="sr" to="sr_Cyrl_RS"/>
Then the result is a combination of sr_Latn with that, giving sr_Latn_RS
sr_Latn_RS
https://github.com/unicode-org/cldr/blob/main/common/supplemental/likelySubtags.xml has
but I don’t see an entry for "sr_Latn".
Please add an entry for "sr_Latn" → "sr_Latn_RS".