Color category preview for Calendar Items unavailable in the latest release of Outlook for Windows

Greetings,

There appears to be a problem with the color category (tags) preview for calendar items are unavailable in the latest release of Outlook for Windows.

In the example below, on the right is the
 

On the left is the latest version of Outlook for Windows (Version 2406 (Build 17726.20160 Click-to-Run)), where the color category preview does not works.

On the right is a slightly older version of Outlook for Windows (Version 2402 (Build 17328.20282 Click-to-Run)), where the color category preview does works.

Has Microsoft acknowledged this bug, and will a fix be issued soon?

Thank you,

Denis