Hi Kent,
Your suggestion helped solve the problem I reported above. I have to be honest I didn't include it as I thought the comment applied to public preview only and now this service is GA. Apologies I should have tried it.
However, the problem I now get when executing such a map is just simply 'BadRequest'. My colleague also got the same and added a scope (try catch pattern) and filtered for failed items which gave more information on the error which was "The .NET framework worker could not be found.".
I've tried a normal xslt 1.0 map that has no script blocks and even that gives 'BadRequest'. If however I take out the "AzureWebJobsFeatureFlags": "EnableMultiLanguageWorker" my normal map works and then of course my map I really want to test gives the error that I previously reported.
So it appears adding "AzureWebJobsFeatureFlags": "EnableMultiLanguageWorker" causes a problem for all maps. I assume then it's down to an extension issue as it may think the above is not a valid option??
Many thanks
Dave