Issue: cannot update group outlook settings via Graph API anymore

Since 1 of August it's not possible to update the Outlook-related settings on a O365 group anymore:

whenever the property "hideFromOutlookClients" or "hideFromAddressLists" is send in a single request (no other properties are modified), the error comes.

The errors comes independent on the context (app-only or user) and occurs everywhere (via Graph Explorer, Graph SDK, etc.).

Is there any known regression or change in this API?