A chunk or chunks very near my oceanfront base started spawning guardians suddenly. My last backup on Oct 2nd does not spawn guardians in this area, but my live version started doing so Oct 5th.

I created a new creative world using the same seed, tp'd to the location and it does not spawn guardians (nor is there an ocean monument)

Possible duplicate with MC-65214 though I am not loading old area created before guardians were added. Also I appear to have the Guardian Sound bug (MC-57057)

Seed: -6501567322576795968
World created in version 14w30c
Current version is 1.8 (upgraded automatically by launcher when released)