[MC-312175] end portal removed after downgrading

when downgrading to 26.3 i went to the end and the portal was missing and gateways

Environment

screenshot after killing dragon NO MODS (i too dumb to get mods)

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[media][media]

just some extra stuff i was at school on Friday so i had to wait till today (Monday) to submit

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Downgrading worlds is not supported.

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