I implemented on my Sharepoint Online tenant Custom People Search Webpart using Sharepoint Search REST API (here to be precise pnp/js library). To find only people related hits I used SourceId: b09a7990-05ea-4af9-81ef-edfab16c4e31 in search body (List of common SharePoint 2013 Result Source IDs - Corey Roth [MVP] (dotnetmafia.com))  . From today 05/02/2023 7:00AM CET this requests started to give 0 results no matter what is queryText. Till this time (or somewhere between Friday 4PM to 7AM Monday) it was >14k results. I tested my app on my company tenant and on my private Visual Studio Subscription tenant. All attempts yields 0 results.

Was there any global change on this topic?

Is there any alternative to this way mentioning I need to refine hits.

I implemented on my Sharepoint Online tenant Custom People Search Webpart using Sharepoint Search REST API (here to be precise pnp/js library). 

To find only people related hits, I used SourceId: b09a7990-05ea-4af9-81ef-edfab16c4e31 in search body (List of common SharePoint 2013 Result Source IDs - Corey Roth [MVP] (dotnetmafia.com)). 

From today 05/02/2023 7:00AM CET, this request started to give 0 results no matter what is queryText. Till this time (or somewhere between Friday 4PM to 7AM Monday), it was >14k results. I tested my app on my company tenant and on my private Visual Studio Subscription tenant. All attempts yields 0 results.

Was there any global change on this topic?

Is there any alternative to this way mentioning I need to refine hits?