WI:No Thunderbolt in Forbidden City

What if in 1421, the thunderbolt does not hit the Forbidden City and Zhu Di does not lose his nerve? Does China retain knowledge of the treasure fleet voyages?
 
I believe he is referring to the thunderbolt that was followed by a fire in the Forbidden City, which subsequently led to bad things like Zhu Di becoming impotent and the conservatives getting more influence.
 
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