Clearer definition of implicit grid?

From this screenshot, since we have already have 4 items, shouldn’t the 5th item be the implicit one because it exceed the maximum of item?
I also meet the same confusing problem when I am coding, that when I set the grid-auto-rows and grid-auto-columns in CSS, and add some more items in HTML, sometimes only grid-auto-rows works but grid-auto columns not. Why does it happen?

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