Fix config dtype parsing for Emu3 edge case (#40766)
* fix emu3 config
Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>
* address comment
Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>
* add comments
Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>
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Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>
