MacOS Calculator currency converter function bug

FWIW, I can verify Currency Conversion has stopped working in Monterey. Since Monterey is no longer supported I don't know if it will be fixed. You can always file a bug report from the feedback page.

Feedback - macOS - Apple

Start with this if IntelMac...

Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode? Could take 10 minutes or more.

Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.

To find out if it's system wide or user specific, try this...

Open System Preferences>Users & Groups, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.

Does it work in the new account?

Currency conversions can be had from the Spotlight dialog by invoking 🔍 and entering the following to convert between two currency entries: