12.2.4 PO Approver decrease quantity and PO don't return to auto create pool

Dear All

I have tested transaction since PR --> Auto Create --> PO

Step

============

1.Create PR and approved

2.Buyer create the PR to PO 100 qty submit to approver

3.Approver see the PO and decrease qty  from 100 to 80

4.Then I return to buyer login to check at Auto create pool but don't found the PR's line that have 20 qty left.

Which is it between new feature of 12.2.4 or bug?

Rdgs

P.R.