When new features get added to Minecraft PE do they appear in existing worlds?

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For example, when they added dungeons and fortresses, would those randomly generate in an existing world? I know things like the nether, where you have to take an action to enter, will work. But let's say they add undersea temples to PE in the future--would I have to start a new world to have a chance of finding one? Thanks.
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Do new Minecraft updates affect old worlds?
\u201cOld\u201d type worlds will not be affected by the update and will continue to use pre-Caves & Cliffs Part II world generation. Players should also note that we will be removing the option to create \u201cOld\u201d type worlds when Caves & Cliffs Part II releases.Will Minecraft 1.18 update existing worlds?
The area that they live in will be the same. However, if they want to find these new features, they will essentially need to load new chunks. New features like biomes and mobs will mostly generate or spawn in these new chunks.Do new biomes generate in old worlds?
You also don't have to worry about your old worlds, even with all the changes the new world generation will bring. Your 1.17 worlds will carry forward into 1.18 without issue.How to Get Back Old Worlds In MCPE 1.19 | How to Recover Minecraft Worlds in 1.19 | Gaming Tactics
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