Okay, so let me get one thing out a few things out of the way first.
1.) This is not cave ambience. I know what cave ambience sounds like, and this is not it. I also have it turned OFF.
2.) It doesn't matter if the game is modded, from what I can tell, this has been occurring since 1.12.2. I've frequently heard the sound in VANILLA 1.14.1.
I frequently hear a weird sound, and I can't describe it other than a woosh or a distant piston. I looked around to see if anyone else has a similar sound case, but it seems that it's just ambience. I stopped playing Minecraft for a bit, then decided to pick it up again trying out the latest version with a few friends. Keep in mind, there is no modding beyond 1.12.2, so this isn't a mod. I've noticed it only occurs outside, mostly in the sky. It's been really bothering me, and I can't figure out what it is. Here's a video capturing the sound:
I'd like someone to help me figure out what this sound actually is, it doesn't seem to be picked up by Minecraft's subtitles, so I can't draw a distinct conclusion.