At my stepfather’s funeral, the funeral director sprinkled holy water on the casket at the cemetary, to which we were all directed to come forward, touch the casket where the holy water was and bless ourselves with it.
I never saw this before either…serving Mass as a young child at funerals only the priest sprinkled the casket with holy water at the gravesite.
Anyway this happened after the burial rite, after the priest sprinkled holy water on the casket, so there is no problem with that happening. It would be a totally different thing if it happened during the Mass or the burial rite.
Ken