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Please specify --site sitename when running bench

These recent days, when running bench command I got this notif

Please specify --site sitename

But when adding --site sitename I got this

Usage: bench  clear-website-cache [OPTIONS]
Try "bench  clear-website-cache --help" for help.

Error: no such option: --site

But the command did executed well.

Is there any change in bench that causes this?