Edit: Ah, this may be a bug in SE 0.6. Reported to them, sorry for the bother. I don't see an option to delete this.

When working in /editor mode (in a separate, dedicated save file), it appears we cannot place a SWW over lab tiles. The tiles are named lab-dark-1, and lab-dark-2, and lab-white. Could this mod be updated to allow us to use water wells in editor a bit easier?

Sadly (though not really) I’m on vacation atm so can’t fix it till mid August. I hope you understand. You can ask is the SE discord

I'd filed a bug a bit ago with SE, and they'd closed it as Won't Fix on their side.
https://github.com/EarendelDevelopers/factorio-mods/issues/210

The patch they propose does seem to work in my testing, so perhaps it's worth adopting.