I don't see this in the known issues list: All my listings with more than 10 available show 'More than 10 available" and the exact total is no longer visible, even with the setting set to 'show exact quantity'.
My setting in Selling Preferences: https://www.ebay.com/uas/selling-pref
I've seen others report this issue, and have had limited success toggling the setting off and on again a day later. I've tried the toggle and it does not restore the correct display of the exact quantity available.