Azure Indexer API behaviour change - Get Video Index

Azure Indexer API
https://api-portal.videoindexer.ai/api-details#api=Operations&operation=Get-Video-Index

Had the following behavior:
When a video is still in progress, Azure Indexer sends a 200 response with parameters:
"state": "Processing", "processingProgress": < value smaller than 100%>,

This behavior has changed in the latest version (API Version:2022-04-13-preview) -->
NOW, when a video is still in progress, Azure Indexer sends a 400 response with the following error response
{
"ErrorType":"VIDEO_INDEXING_IN_PROGRESS",
"Message":"Video is still being processed. Trace id: 'c5ff8411-e679-4bfb-9396-88d6b34d237f'."
}

As our enterprise product relies on this Azure Indexer API, I would appreciate it if Azure team can explain this behavior change, and the reasoning behind going from HTTP Status 200 to 400.