Using Classic Outlook on Windows for personal email, calendar, and contact management
Duncan,
I apologize for the delay. The fix was checked into build 16227.20202 but it got checked in after the first build of Version 2303
16227.20212. The fix will go out in the very next build of Version 2303. If nothing changes it will be Patch Tuesday 4/11/23. There is a slight chance it will go out sooner because another important fix also missed this first release also. This may cause the Outlook Team to do another interim release. You can monitor Update History to see if another build goes out before next Tuesday, Update history for Microsoft 365 Apps (listed by date) - Office release notes | Microsoft Learn.
Incidentally the fix is also not yet at the Beta Channel either. The fix went to Beta in build 16323.10000. The builds with that fix were rolled back because of a bad bug. It will be in the next build of Beta that goes out, Update History for Office Beta Channel - Office release notes | Microsoft Learn. That should be tomorrow as build 16403.20000. Beta is trickier though so if you try Beta check the link I shared for release status.