Why initializeOffsets executes by fork in startUp method?

startUp: resuming
    resuming ifFalse: [ ^ self ].
    [     self initializeOffsets.] fork


Cuise has this version:

startUp: resuming
    resuming ifFalse: [ ^ self ].
    OffsetsAreValid _ false.
    [
        self initializeOffsets.
        OffsetsAreValid _ true
    ] forkAt: Processor userInterruptPriority.


Why not just

startUp: resuming
    resuming ifFalse: [ ^ self ].
    self initializeOffsets.

?

I have appilcation. And sometimes when I run squeak I have bad dateTime
equal to last saved value.

I cant reproduced it manually.
Can it be due wrong squeak implementation?
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