JDE E1 9.1 - Voucher records deleted from F0411 but remains in F0911 and F43121

Has someone come across an issue where voucher records vanishes from F0411 but remains in F0911 and F43121?

I am frequently seeing an issue that UNPOSTED MATCHED voucher records get deleted from F0411 but remains in F0911 and F43121 (with match type 2). Vouchers are created in purchasing module as C/R field value in F0411 is M. Program used to create voucher is P550411.

Currently its not clear if they get deleted from F0411 at the time of creation of voucher or at the time of reversing it. I believe this happens at time of reversing. Reversing an unposted voucher should delete it from F0411 and F0911 and update F43121 accordingly. So deletion from F0411 is fine. But why doesn't it delete from F0911 and update F43121?