Work Definition showing all Substitutes Items even ones that were deleted from Primary Item

Summary:

Corrected Substitute Items on the Item Structure (used a change order), to remove 2 substitute Items. After Change Order approved, run update Item Structure changes to Work Definition. Everything on the Work Definition is in alignment with the changes that were made. However when I print the work definition report, it still shows the 2 substitute items that were removed. Ran based on an As of Date that was after the date the change order was made. Why do these substitutes still show in the report even though they are no longer part of the Work Order Definition?

My expected results would be if I ran a Work Definition Report based on an As of Date, I would only get the components and substitute Items that where in effect as of that date.