I got prompted to update the game a few days ago but after doing so I can no longer restore my pre-update saved games. I can however create and restore new games.

The error message found in the log:

Starting game
Unable to restore the saved game.
Failed to restore the savegame component.
(#11) Script Modules, version 0, at offset 2366973.
Saved content does not match current game.
Mismatching number of global script data (game: 9632, save: 10852).
Quitting the game...
An internal error has occurred. Please note down the following information.
If the problem persists, contact the game author for support or post these details on the AGS Technical Forum.
(Engine version 3.6.0.50)

Error: Unable to restore the saved game.
Failed to restore the savegame component.
(#11) Script Modules, version 0, at offset 2366973.
Saved content does not match current game.
Mismatching number of global script data (game: 9632, save: 10852).
***** ENGINE HAS SHUTDOWN

I believe I was very close to the end so it would be super if there's a solution to this problem :D
Using Linux and launching the game via the Heroic game launcher.

Cheers