In the spawn world, where you begin as a spirit with no body, I had a couple of "experiences" that got me XP - one with a willow tree, and another I don't remember. Thanks to it, I was able to research foraging and pottery and build a kiln. And I might have fired it up with the q1 clay artefacts I'd made, if I hadn't made that new-old bed out of branches and slept in it, which blanked out all my progress and turned me back into a spirit with no characteristics.
I know you can dig clay, pull stuff off trees &c. But are you supposed to be able to get XP by accident before you burn yourself in the fire? It seems to me you shouldn't be able to do that. I never did get to test whether you keep what you learned - and whether that messes up some of the opening quests.
Wish I'd taken some photos, but I swear it happened.