We added (and thus exposed via *) some exports, mostly types. We should either (A) also account for new exports added over time in our book-keeping or (B) say the older packages have their exports frozen entirely and to gain access to new things you must shift. I suspect (A) is better, and what we should do is create a mapping of file-to-file for any unknown tokens so we aren't constantly updating the list.
We also don't error for legacy import paths if they import tokens not in the current list - we should.