Train wheels don't fall off because both components, the hub and the steel tyre, are made of the same metal.
Expansion rates are identical with both components, so the interference fit is virtually unaffected by temperature extremes.
The problem with these engine cylinders and heads, is that the basic head/cylinder design is faulty from the word go - because the expansion rate of aluminium when heated is considerably more than steel. Thus the basic design is setting up the owners/users for a fail.
A good cylinder and head design would have the interference fit zone and thread area, remaining the same interference fit, at all temperature extremes encountered - or even tightening at higher operating temperatures.
The entire cylinder/head design needs to be seriously reworked to eliminate the major reduction in clamping force in the interference fit zone, when operating at high cylinder head temperatures.