Things you're mentioning were present in 0.319.1, 0.3.19.2, 0.3.19.3 etc. Which weren't published by Majalis yet btw. There are no new Wasp arts, fully available Gadgeteer scenes, and all that stuff in public 0.3.19.
So, public 0.3.20 = Patreon 0.3.19.1... 0.3.19.4