The Sprint field is updated w/ the sprint value as soon as the issue is added to the sprint. It is not when the issue is completed. In fact if an issue in a sprint is not completed in the sprint then the sprint values will accumulate. For example, let's say that an issue is first assigned to Sprint1 and not completed and then Sprint2 and not complete but finally is completed in Sprint3 then the value in the Sprint field for this issue will be "Sprint1, Sprint2, Sprint". Unless of course the field is edited to remove the previous sprints.
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