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OK,
but prerequisit is, that both definitions are identical.
Especially in the Storage definition, where properties are mapped to globals
a selphy ?? 😉
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So it's clear.
Old_Class loads old defined properties in a local Object structure
and writes only this structure back.
It has no idea of New properties and doesn't write it.
Just a guess:
$LB(...) in ^GlobalD of Old_class is shorter than for New_class
So %Save() of Old_class is a data killer.