A Carrick bend can be seen here...
Beautiful picture !
As you know, having the entry line constrained by multiple loops before making a sharp turn is a good thing.
It would be a good thing,
if it could be constrained=nipped by "multiple loops"= nipping turns - but it can not. The continuations of the Standing ends which still carry the 100% of the loading, can only be forced to have some deflexions from a straight path, before they enter into a constricting = nipping loop. The good thing for the Standing part is first to make the sharp turn, and then only, at the second line of defence against slippage, to be constrained=nipped into/by multiple nipping loops. Any premature constriction of the Standing part
before a sharp turn = a collar, is only a waste of the knot s constricting / nipping ability.
However, this is a subtle issue that should not be discussed at this point. If the bend holds, and if it is strong, we will see why...