It's a bit hard to explain but the players pointer doesn't funtion when crouched or atleast when your looking forward, either way still gets effected when crouched you could "misplace" a block because the pointer is actually pointing the way you would be if you where fully standing it makes it hard to bridge or generally built anything I think the cause is the lil extra down yall added the crouch mehchanic in the first place.

If you need a better example then please look at the images below, it might help