PO not showing pre processing lead time in supply plan

Summary

PO not showing pre processing lead time in supply plan

Content

We have pre processing lead time setup on our parts. When the supply plan runs(unconstrained) it calculates the suggested order date = suggested start date - pre proc LT and we can see that on planned orders and work orders but on POs we are seeing the suggested order date = suggested start date. Is this by design?

The plan is accounting for post processing LT on POs and calculating suggested dock date = suggested due date - post processing LT but does not seem to account for the pre processing LT on POs.