Hi there!
I think if you want a perfect pixel movement, the smooth scroll does not combine with that. Since smooth scroll works with pixels in a nos pixel perfect format. Like, the scroll speed can be sometimes decimal numbers. Mostly when the camera is slowing down to catch up with the player when he stops moving.
But maybe you can try that to fix the issue(I'm presuming you also has a pixel perfect game)
Hakuen Studio Pixel Perfect for RPG Maker MZ by Hakuen Studio
Otherwise, you can hit me on discord: hakuenstudio
Send me a sample project replicating the issue so I can better understand and try to find the problem. Because if I remember well, I think I had fixed that jittery issue a long time ago. Let me know ^^