Well this is more of an bodge than a bug. Mission 3 (I think it was) of Apocalypse ran on disk 2. Worked fine...until you died.
'Insert Disk 3'
*You insert disk 3. It loads for a bit. You await for something spectacular to happen* ...
'Mission Failed. Insert disk 2'
I mean, surely they could have fit 'Mission Failed' onto disk 2 so that you don't have to insert another disk to get told that you have failed the mission.
If I remember correctly there are quite a few bodges in this game. Seems like a rush job. Quite a good game though