I wrote a little Test Class demonstrating my problem. It is just one class named JtOSStructureTest which subclasses OSStructure. It has two members: version and pin.
You can load this Application into a 9.1x64 image and inspect JtOSStructureTest testThisClass
While this runs in 9.1, it yields an error in 9.2, stack is attached
Here is what the Transcript says about the 9.1 image VM (where the code runs):
VA Smalltalk V9.1 (64-bit); Image: 9.1 [413]
VM Timestamp: 4.0, 07/18/18 (100)
And this is where it fails:
VA Smalltalk V9.2.2 (64-bit); Image: 9.2.2 [2]
VM Timestamp: 4.0, 05/15/20 (102)
I am almost sure I am doing it wrong. But I don't see where. Any hint is greatly appreciated