Sometimes a studio or venue or what have you moves physically. Sometimes a place is shut down and taken over by something else that we want to have in the MB db (a venue closing and becoming a studio or vice versa, as an example). Currently we have no way of recording this, other than through similar relationships/data (e.g., same website, same address). There was some talk about this back when Places were first introduced, I believe, but I can't remember if it was IRC only or if there's also something in -style.

Anyway, a few examples:
https://musicbrainz.org/place/ba096a11-9e20-4883-b5ff-fb93cbae558c -> https://musicbrainz.org/place/ff5f8be9-0f52-49c2-a5b7-9834f5135bd7
https://musicbrainz.org/place/6c8242be-15e4-466f-a3ac-85d34ead102f -> https://musicbrainz.org/place/32c2b16a-3c70-4385-9205-8b0d3961a6a6