Ongoing SharePoint Search Issue Across Multiple Tenants: Missing Managed Metadata Crawled Properties

We've been seeing Microsoft Search issues across multiple tenants where Managed Metadata fields are not appearing as crawled properties, making it impossible to map them to managed properties.

A member of the PnP Modern Search community pointed us to Service Health incident SP1393483 ("Admins may have been unable to see the configuration search schema mappings in SharePoint Online"), which Microsoft reported as resolved at the end of July:

https://admin.cloud.microsoft/?source=applauncher#/servicehealth/history/:/alerts/SP1393483

However, we're still seeing these issues across multiple environments.

Sharing this as a heads up in case you're troubleshooting similar SharePoint Search or metadata mapping challenges. It might not just be your tenant!