Losing fuel after loading game


I’ve encountered something of an annoyance. Everytime I load the game, I lose all the fuel that was left in a barrel which my ship was using when the game was saved. Is this a bug, and if yes, is it something I can fix?

In case it’s relevant: I have both the original game and Zubmariner (from GOG). I used GOG Galaxy to install them, and according to GOG Galaxy my version of the game is DLC)a.

Thank you.

I am encountering the same issue on the GOG version (same exact version). We have the identical situation in terms of setup.