Updating a vanilla world

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    Hello, i have a Vanilla Server with my brother and we play Survival, my question is, how can i safely update the world from 1.19.3 to 1.20 (when it comes out), without incurring in bugs or something bad? And how the world will update? For example: the mangrove swamps will spawn in new chunks or in existing and explorated chunks? Or both? Thank you for the help!