Should sidecar work in clamshell mode?

I found a clunky and annoying workaround, hopefully it helps other people who just want to get their work done. Steps:

• Connect MacBook to power
• Connect iPad to MacBook via usb-c cable
• Connect iPad to MacBook via Sidecar
• Close MacBook (Sidecar will seemingly disconnect)
• Unplug power cable from MacBook
• Plug power cable back into MacBook
• Press any key on bluetooth keyboard
• Your MacBook Lock Screen should appear on your iPad, in Clamshell mode

This is of course not ideal, but if you’re someone who just needs a versatile workspace, it’s better than nothing. And if anybody is wondering, upgrading to Ventura did not solve the issue.

Just updated to 12.6 Monterey, and having the same problem. Can’t mirror the display of the M1 MacBook Air on iPad now either, open or closed.

Yes, I'm having the same problem after the latest Monterey update. I tried this method on my Monterey 12.4 M1 air, iPad becomes the main display when lid closed.