This has been reported in pharo fork as pharo-project#179 and also affects upstream opensmalltalk-vm

| result obj |
result := OrderedCollection new.
obj := { 1. 2. 3 }.
result add: (thisContext objectSize: obj). "Should be 3"
obj become: { 'a'. 'b'. }.
result add: (thisContext objectSize: obj). "Should be 2, but is 0"
Smalltalk garbageCollect.
result add: (thisContext objectSize: obj). "Should be 2"
result
 "an OrderedCollection(3 0 2)"

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