I'm glad you posted the pic: from the way you phrased the question I had totally misunderstood what you were asking.
I think the sheet music assumes that any guitarist following the chord shapes rather than the music notation is going to be playing a fairly simple rhythm. If you were playing from the dots you would actually anticipate the change in the melody. Look at the bass line: on the fourth beat it is playing a G and an E - that means it has moved away from the G chord half a beat before the melody gets there.
But if you were just playing rhythm guitar, it doesn't always sound so good to stick too close to the melody - you would lose the rhythm. The melody often dances around the rhythm. So I think your statement is correct.
You should interpret it the way you like it best. I'm pretty sure that the composer of the song didn't stick those chord diagrams in - and they may not even have written it out in standard notation so your interpretation is just as valid as anyone else's.
Play it loud whatever your interpretation.
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