I'm experiencing a game-breaking bug in the final part of Snufkin: Melody of Moominvalley. Here's what happened:

I was in the final part of the game where I needed to destroy all the objects in a garden to progress. Unfortunately, I missed one object and didn't get the achievement.

I exited the game when FILLYJONK was leaving the house, during a dialogue scene, to try and reload for the achievement.

After reloading the game, everything I had previously destroyed was still destroyed, except for the one object I missed. I destroyed it and got the achievement, but now FILLYJONK won’t leaving, and the game won't progress any further.

It seems the game auto-saved at a point where it's now stuck, with no way to revert to an earlier save or trigger the next event.

I've tried the following to fix the issue, but nothing has worked:

Restarting the game and reloading the save.
Walking away to other areas and returning.
Uninstalling and reinstalling the game.
Loading the game after completely closing it via Task Manager.

Unfortunately, none of these actions have resolved the issue. Since the game uses an auto-save system, I can't load a previous save to bypass the problem. I'm stuck in this state and can't continue the game, even though I'm so close to finishing.