Why is this array having all remaining values initialized to zero?

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C11 6.7.9 Initialization p19 covers this (my emphasis)

The initialization shall occur in initializer list order, each initializer provided for a particular subobject overriding any
previously listed initializer for the same subobject;151) all
subobjects that are not initialized explicitly shall be initialized
implicitly the same as objects that have static storage duration.

Section 6.7.9 p10 states that

If an object that has static or thread storage duration is not
initialized explicitly, then…if it has arithmetic type, it is
initialized to (positive or unsigned) zero;

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