Seriously I truly don't understand why sooooooo many Adult Game Developers just for whatever reason can't stop forcing peoples old saves too break and not be usable at all, fine if the save is from 3/4 versions ago maybe, but literally from the previous version. Like my guy it doesn't matter how great your game is, forcing people to constantly replay the same game version after version after version will literally stop people from even giving your game a shot because of how annoying and prolific this type of stuff has become recently especially with this longer running games. Both this and Milfy City, games and stories literally running for 5+ years finally get completed and nope any saves you had from years ago won't work.
It is because they are different engine build/upgrades, when they happen most saves break. Ren'Py due to changes in the code, security changes, many factories sometimes the save breaking is unavoidable, and yes sometimes you can say developers don't need to update the engine, but sometimes they do to be able to add new features to their game.
Unity had to be updated as it had a serious issue with a major vulnerability.
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There are other issues to at play why saves don't work once the move went to Steam.