I have a copy of a marriage certificate which does not state the father as deceased, even though he was,. The marriage took place in 1860.
I think earlier certificates may not have stated this, possibly if the registrar or vicar did not know the family too well. I don't think people were deliberately lying, I suspect they were not actually obliged to state whether or not the father was deceased.
The rules may have changed later, possibly in 1875 when laws on registration changed. (At least, the laws tightened up for births so I assume they may have changed for deaths and marriages, too.)
Perhaps someone else can help out here?