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Not if they're coming from a country with a risk of yellow fever.

You're really setting up very narrow condition in which someone might not need a certain vaccine. I'm saying that there's a history in which vaccines and immunizations have been required. If Japan had a yellow fever epidemic, Bangladesh would most certainly require it, just like they do if a Japanese person is coming from a country that does have such an epidemic. That's the precedence.

Saying they require a covid vaccine from a country with a covid epidemic is them applying existing restrictions. And currently, people arriving from most countries are dealing with an epidemic. 5 years ago Bangladesh authorities would deny people for not having yellow fever immunizations. They're within their rights to do the same for covid.