`Menu' does not contain a definition for `SetChecked'

[noio]

When I put UniVSCode inside the "Editor" folder (because it's using UnityEditor; ). I get the following error:

'Menu' does not contain a definition for 'SetChecked'

If I put it in the Plugins folder, I don't get the error, but I can't make standalone builds.

It might be a Unity bug. I've worked around it by using #if UNITY_EDITOR instead of the "Editor" folder.