User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:95.0) Gecko/20100101 Firefox/95.0

Steps to reproduce:

var estonian = Intl.DateTimeFormat('et', {month: 'short'});
var english = Intl.DateTimeFormat('en', {month: 'short'});

estonian.format(new Date('Sept 1, 2021'));
english.format(new Date('Sept 1, 2021'));

Actual results:

estonian.format returns "september", while english.format returns "Sep"

Expected results:

estonian.format should have returned short version of the month

The Bugbug bot thinks this bug should belong to the 'Core::JavaScript: Internationalization API' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

This is explicitly requested in the underlying CLDR data:

<dateFormatItem id="MMM">MMMM</dateFormatItem>

The short/abbreviated form "MMM" is mapped to the wide form "MMMM". (https://unicode.org/reports/tr35/tr35-dates.html#dfst-month)

This should be reported to the CLDR project, but ultimately the CLDR language vetters for Estonian will have to decide what form to use in this context.