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May be better to point it to https://github.com/squeak-smalltalk/squeak-app/blob/squeak-t...
It is true, that there is uncollected garbage in the original Xerox ST80 image. I've built some tools to analyze the image and also a VM which can be interrupted at any time to analyze the current state of the image (see https://github.com/rochus-keller/Smalltalk).
There are two zombie processes (OID 6662 and 19ba). There are also a couple of BlockContext and MethodContext which have a nil sender and a reference to an unknown method, but which are still referenced from somewhere (i.e. the collection is prevented even if it is not implemented by reference counting. E.g. OID 79a2 of class BinaryChoice. I have a full list if anybody is interested.