A change in the Amazon Kindle Publishing guidelines relates to this.
Version 2016.1:
Quote:
5.3.2 Defining Start Reading Location
The Kindle platform supports landmarks nav elements and guide items for defining the start reading location (”Go to Beginning”) in reflowable books. Do not set the start reading location to a blank page. ...
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Version 2017.1:
Quote:
5.3 Guide Items
...
Publishers do not need to define a start reading location because Amazon does this during the upload process.
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It seems from your experience that "do not need to" really means "should not".