En sublocale abbrevated month not aligned with in CLDR 42 chart

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
48/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
cpp

Research direction

Start with the CLDR 42 chart linked in the issue and reproduce the abbreviated month values for the listed en sublocales using the reported ICU 72.0.1.4 environment. Compare the results with the chart's June, July, and Sept entries, then determine whether the discrepancy is expected data behavior or an ICU defect. Done means the issue has a confirmed explanation or a clearly scoped correction path.

Written by the indexing model from the issue text.

Description

Version 72.0.1 release note confirmed alignment with CLDR 42.

According to the the CLDR 42 chart in the following link (same in its latest version CLDR 48), the "Gregorian | Months - abbreviated - Formatting" of "June, July, Sept" should be 4 letters if en sublocale code is referenced (the list of sublocales are on top of the page, such as en_NZ, en_AU, en_GB) https://www.unicode.org/cldr/charts/42/summary/en.html#24f836ce69a11cfc

However, it seems that only subset of these sublocales, such as "en_NZ, en_SG" have applied "Sept" (I'm testing in Win Server 2025 icu.dll version 72.0.1.4). And none of these sublocales have applied "June, July" abbrevated format.

Could you please confirm wiether it is a bug, or something wrong with my understanding?

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C++
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