Major update 1.17 removed the Dismantle into permanent stats feature, among other changes many players don't like. Will it return? Who knows. We can downgrade to 1.14 in the meantime using the Steam Console.

Edit: This was a guide on how to rollback the game version using the Steam Console, but it's no longer necessary since the developer has added 1.14 as an option from the Beta tab!

You can simply go back by right-clicking on Megaloot in your Steam Library, clicking Properties > Betas > Select 1.14 - older version

A huge thanks to the developer for making it an option!