Impacts of change in Calculation engine in 4.3 SP4 Patch11 and Workarounds?

Hi All, I am back after failing to upgrade to SP4 because of various issues that we were seeing in the release notes, and due to SAP’s Vulnerabilities suggestion, we are planning for an emergency upgrade from SP2 Patch9 to SP4 Patch11.We installed the new version in Sandbox and are testing the reports. I am receiving complaints about missing rows due to change in calculation engine(suspecting there is a change in calculation engine ). Can you please provide any issues experienced due to the calculation engine changes and workarounds that fixed the reports ?
I reached SAP for any known issues in SP4 Patch11 and as usual, they are not helping with such information.
Thanks,
Srinivas