do div paying ETFs go down temporarily post ex-div date?

from what i understand generally stocks go down on ex-div date as there's a temporary, 1-3 day, price in on the shares that don't yield dividends, but does this apply to largecap ETFs?

SPY ex div date july 17th, does this mean we can expect more selling pressure on the 18,19th?

apologies if this is a trivial question, but i suspect this is a good place to ask