Players who only have access to the 2014 Player’s Handbook will maintain their character options, spells, and magical items in their character sheets. Players with access to the 2024 and 2014 digital Player’s Handbooks can select from both sources when creating new characters.
Weird. It’s worked incredibly fine for me in app or desktop. I play and DM.
To each their own, but your “incredibly fine” is my extremely mediocre, also as a player and a DM.
It’s especially disappointing how bad it is since the corporate lizards at WotC/ Hasbro have had plenty of time at this point to dump some money into the project and get it up to snuff since the acquisition of DnD Beyond.