Got it fixed, just try to ignore it for now. ;)
I'll clarify what I do and don't consider a bug. The configuration you're using right now, where Space Age is loaded without a proper add-on, I call it "lonely Space Age" in the code (or LSA for short). (If you've ever played Baba Is You, think of the rule: LONELY SPACE-AGE IS BROKEN.)
My goal for LSA is that you can close one eye and ignore the Space Age techs, and everything should be the same as ordinary IR3 except for infinite techs (and Deadlock transponder). The tree is in a "prepared" state for the add-on to operate on. I don't officially support it of course.
I just added surface conditions to all of IR3's chests for LSA, and I consider it a bug that they didn't match. I may allow steam machines in space (they're not using combustion after all), but vehicles won't be allowed.
EDIT: __space-age__/base-data-updates.lua is a good example of the sort of things LSA will be changing.