Why the placekey is the same for different addresses?

Hi everyone, I am working on getting the placekey for house addresses. And I found two special examples where they are different addresses in Google Map but get exactly the same placekey. According to the placekey, these addresses should be different in the first three characters of the “what” part. Does anyone know the reason for this situation? Happy to provide more details.

Example 1:

Example 2:
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