While Crommie did much during his tenure, when he died no one had the same charisma and fortitude and the Monarchy returned reinstating much of what was dissolved. In a show of how mad the monarchy were, Charles II had the bodies of Cromwell, Ireton and Bradshaw all exhumed and "executed" by being hung and beheaded. Obviously this must have been terrible for them... being executed after being dead for a year or more.
They were probably over the moon wherever they were that they had pissed Charlie off so badly to have them executed post death.