DateFormat('MMMM') outputs lowercase month names for some locales, inconsistent with English capitalization

[itsjasur]

When using DateFormat('MMMM', locale.languageCode) from the intl , the output for the full month name (MMMM pattern) shows inconsistent capitalization across different locales.

for the English locale (en), the month names are correctly capitalized (e.g., "May"). However, for certain other locales, (ru, fr, tr, etc..) the month names formatted with MMMM are output in lowercase.

DateFormat('MMMM d, yyyy', 'fr').format(date);
DateFormat('MMMM d, yyyy', 'fr').format(date);

[mosuem]

I believe this is WAI - see https://st.unicode.org/cldr-apps/v#/fr/Gregorian/. Or do you have other information?