ZCX: PWA vs Client

[TCSDIRZCC]

Is there a list of parity differences between PWA and Client for ZCX.   One major item I have discovered is when using custom variables which are configured to display on inbound notification - works as intended within the Zoom client, however in using Zoom PWA - no variable information will display.   

I confirmed that it is being passed as it is displayed in the custom variable section of the engagement tab.

Curious on how to resolved this, but even more curious of other functions not available through PWA.