In survival, if I use the build modifiers, oftentimes all blocks except the first one get placed at the wrong place, one block offset in one direction. It doesn’t always happen, but roughly 30% of the time, so it makes the modifiers pretty unusable. This happens with all build modifiers. It seems, that this is related to the view angle when placing a block (if I don't rotate the player after it happens, it always happens again the same way.) Also if I want to place slabs, it places them both on the top and bottom and stairs are also rotated in different ways. I’d assume, that this has the same cause.
PS.: This doesn't happen when breaking blocks, only, when placing them.
I'm playing in 1.16.5 on MacOs Big Sur.