Also save data is not shared between the versions, so if you’ve already sunk a lot of time into playing the buggy native port, switching to proton requires you to start over.
To mess this up one as to be a special kind of stupid. It literally only requires to set up a few paths on the SteamWorks web UI: https://partner.steamgames.com/doc/features/cloud?l=english#steam_auto-cloud