I have corrected the issue. The problem was the order of the operations in the Post Functions.
The setting to the "Fix" and "Affects" Versions had to come before the "Creates the issue originally" step (Step 1 above). It did not matter for the "Assignee" field. I moved Steps 1 and 2 above to just before the final step.
I don't understand why these fields behave so differently, but my issue has been resolved.
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