Yes, I've tried my own key and it doesn't work as well.
I've tried a simplified version with just "get started" maps. I've also tried the latest chromium 112. The problem preserves. There is no info logged, the maps simply don't load visually or emit js events. I've also tried to put it into flxexbox. I don't know how to further troubleshoot it, it's related to chrome and google maps more than to jsreport.

I found this related bug in chromium.
https://bugs.chromium.org/p/chromium/issues/detail?id=915389

Perhaps it gets propagated to a new release, but I am a bit skeptical.
Chrome fixes come very rarely.

There is a single page so it looks right the 1 inside the pages array is 0.

Note you should include mergeWholeDocument in the request

...
"pdfOperations": [
 {
  "type": "merge",
  "mergeWholeDocument": true,
   ...
}

"when the report is generated the 0 is always 0."

I apologize but it doesn't make sense to me, neither your original question.

I see the following error in the log, google could be blocking it.

(console:error) You must enable Billing on the Google Cloud Project at https://console.cloud.google.com/project/_/billing/enable Learn more at https://developers.google.com/maps/gmp-get-started

We would also like to know difference between On-Premise and On-SaaS license and which one is more suitable for us.

The on-premise license is used in your environment. This means you download jsreport to your server where you host it.

The https://jsreportonline.net is SaaS where we provide you with running jsreport without a need to host it or update it. You just pay the monthly fee, but you don't have access to the jsreport system or HW configuration .
https://jsreport.net/learn/online-faq

Based on this infrastructure need we would like to purchase the cost friendly license.

Every instance that is potentially facing production users/systems needs a license. In case you deploy to an environment where you scale (servers, pods,containers..) to multiple instances, it is typically better to purchase a more expensive scale license, because then you apply a single license key to all of the instances. In case you deploy just to a single jsreport instance, you can purchase a cheaper enterprise license.

Please find respective details here
https://jsreport.net/buy

Minimal means no styles and irrelevant things :)

So your request includes no data?

Please elaborate more... Primarily please share the minimal code you send in the request.

Please upvote here, we will try to get to it soon when there is growing interest in it.
https://github.com/jsreport/jsreport/issues/1038

Please replicate the problem in a MINIMAL public repository so I can take a look at the code.

Do you need to use the compare-pdf just because of some unit tests? Perhaps you find a better way of testing.