Hi @ashkas
This is a limitation of WordPress, not ACF.
ACF uses the same built in image editor/modal as WordPress core so any features available (or not) in WP Cores modals (like when you’re setting featured image) will also apply to ACFs image, file and gallery field types.
You’re probably better of looking for tickets regarding this here: https://core.trac.wordpress.org/ or possibly create one yourself and see what response you get. 🙂