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Only changes to package.json or tsconfig.json might affect that. Any diffs in there?

I thought so too, but my tsconfig is exactly as pulumi has created it, and package has only name and dependencies. That's why I have a real problem here, there doesn't seem to be anything to have caused it. Tried going back to previous git commits and previous pulumi versions... Is there something cached?

Your npm/yarn packages, and Pulumi plugins are cached. The plugins won't affect it. The packages might, since ts-node/tsc is a package and it might have changed. It might be easier to abandon trying to figure out what caused it, and instead figure out how to change it.