SNP optimizer - increased cost in the last improvement

Hello experts,

After our last APO system upgrade to support package SAPK-71311INSCMAPO and optimizer version 12.0_REL SP00, we noticed that in the solution quality of the optimizer log, where total cost for each improvement is shown, the cost of last improvement is increased compared to the previous. In the optimizer profile we use restrictions for maximum runtime and number of improvements. We expect that cost after each improvement is decreased or stay the same compared to the previous.

Any idea if something is changed and why we have this behavior now?

Example:

Best regards

Angeliki