Hard drives disappear if files are changed when the game is not running

[tomkcook]

Describe the bug
Changing a file on a hard drive by editing the file on disk while the game is closed causes a dialog on loading the savegame asking whether to keep the files on disk or replace them with the files in the save. Selecting "Keep the files on disk" results in the hard drive disappearing from the drive holder in the computer case.

This is 100% reproducible on my system.

To Reproduce
Steps to reproduce the behavior:

1. Build a computer with a drive holder containing a hard drive.
2. Create some files on the hard drive.
3. Note the UUID of the drive.
4. Save the game.
5. Close the game.
6. Find the drive files in FactoryGame/Saved/SaveGames/Computers
7. Make a change to a file.
8. Open the game and load the save created above.
9. A dialog will present asking whether to keep the changed files on disk or replace them with the files from the save.
10. Select "Keep the changed files on disk".
11. Look in the computer case. The drive has disappeared.

Expected behavior
The drive should still be present with the files as editing on the host filesystem.

Additional context
Running under Steam / Proton.

Attached the debug file from SMM.
SMMDebug-2025-01-01-17-36-29.zip