just curious, can you give me an example of a jurisdiction where that understanding of mine, would be invalidated pls?

You'd want to look for whatever the local analogue of "possession of stolen goods" is. Typically, being unaware of the provenance of any given asset is not a legal protection. E.g. if I buy a stolen watch - generally most western courts would not then find that I am the legal owner. There's not a whole heap of precedence when it comes to digital assets (espcially specific to defi), but it's clear that the assets in question here weren't sold their rightful owners