I saw the movie a few times in theaters and DO recall hearing Banner groaning (it was almost like a faint squeak). As a matter of fact, last I remember I found his groaning to be one of the funniest things about this scene.
After looking up a bunch clips of this scene on YouTube (still waiting to get the movie on Blu-ray/4K), in all of only Hela’s “dog” is heard making any sounds. But, I initially did I hear Banner groaning in pain, so it felt strange not to hear any sound coming from him this time around.
I’m skeptical but could there be some truth to this Mandela effect thing? Haha. I suppose we’re most likely misremembering things. If there is any chance we’re not, then perhaps they removed the groaning for the movie’s home release (for some reason).
Anyone else? Heh. It still seems sort of odd to see Banner just laying there and remaining completely silent. Worth noting is is the fall almost - or it likely - killed Banner but Hulk clearly had something to say about that.