I also observe that when a paper is sent to Springer for typesetting, they will correct the cities. Going forward, I think it's a good idea to have crypto23pub and crypto24pub separate, referencing springercham and springeranothercity, instead of a single cryptopub referencing springer.
Springer's instruction is, for example,
CryptoBib currently cites all "Springer" as "Springer, Heidelberg[, Germany]".
I also observe that when a paper is sent to Springer for typesetting, they will correct the cities. Going forward, I think it's a good idea to have
crypto23pubandcrypto24pubseparate, referencingspringerchamandspringeranothercity, instead of a singlecryptopubreferencingspringer.