The title says it.
To keep it short: Update 1.19.3 makes scaffolding non-spawnable blocks. Unfortunately though scaffolding general mob farms where some of the easiest to build most effective mob farms for beginners and beyond.

The update renders existing farms useless ruins and robs beginners/casual easy going players of the ability to make use of said superb farms.

Therefore a toggle to allow spawning on scaffolding again would be most welcome.

Thanks for considering.