Alex EB saving games compatible with vanilla EB

[Raygereio]

I know, but my FMs die naturally, that's why I sad I haven't met with that hidden trait.

Then you've must have added the immortality trait somehow, if you haven't done it yourself, perhaps you're using Maksimus' stuff?
If you don't have that trait anywhere in your EB files, then something funky is going on with your game.