If you add a texture pack when creating a world and then try to change the settings, all of the packs you added will be reset. If you create a world without changing any settings, your packs will be kept. No matter how many times you try to reset it, it will reset unless you create a new world. It should be possible to simply change the texture pack settings and not reset the texture pack.
MCPE-231692
When creating a world, changing the texture pack settings will reset them.
Resolved
Duplicate
1
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We're tracking this issue at MCPE-230216, so this ticket is being resolved and linked as a duplicate.
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