The new FrostWalker enchant allows water to be transformed into frosted ice. On a server using GriefPrevention or PlotSquared you would expect them to prevent the creation of frosted ice in order to preserve the currently existing flow/pattern of water. It may hinder the usefulness of the enchant but it can be considered grief to others.
tl;dr FrostWalker should be triggering an event so plugin developers can cancel the formation of Frosted Ice. It would also be helpful to listen to when frosted ice melts.