[Tf-m] ARM.TFM CMSIS pack questions

Greetings!

I am working on adding support for IAR Embedded Workbench for ARM (EWARM) to the ARM.TFM.1.1.0 CMSIS Pack and in the ReadMe.txt file in the pack there is a list of limitations, of which I would like an explanation for the following: ---     2. The Non-Secure API supports CMSIS 5.2.0 version only. ---

What specifically requires version 5.2.0 that would not work with a later version?

The problem is that I've run across some issues that needs fixing in the ARM.CMSIS pack as well, so I've fixed these in the upcoming 5.5.0 version and would like to know what the issues are using this version with TFM?

Thanks, /Thomas