Another modern iteration, at least to me, is the Catholic view of the sacrament of marriage as it pertains to divorce vs. anullment.
In the RCC view (and I recall reading this in the CCC but don't feel like looking it up), the couple being married are the officients of the sacrament (not the material of the sacrament, as they are in Orthodox theology). Donatism, in a sense, says that sins of the officient can invalidate the sacrament. Annulment, in the RCC sense, CAN be predicated on the idea that one or both members of the marriage were not fully invested in the sacrament.
In other words, a flaw (a sin) on the part of the officient is being used as cause to declare the sacrament as having "never happened" - as being invalid.
That sounds like donatism to me. I've posed this question a few times to different RCC thinkers I respect (and there are many I have a deep respect for) and haven't yet recieved an answer that satisfied me. I'm not posting it to pose an argument against the RCC (i.e. I don't pose this question to RCC christians as a polemic against them) - more just a theological question that I'm either misunderstanding or which presents a potentially serious flaw in the RCC's current sacramental theology.
To me, the easiest thing (and the thing most consistent with the theology of other sacraments) is to have the married couple be the material of the sacrament, and the priest be the officient. No flaw in the priest could invalidate a marriage sacrament.
That, or recognize that the sacrament worked (i.e. was valid) but that human sin sullied it the same way that our sins post-baptism can sully our baptism (requiring confession and such). In other words, recognize divorce
In Christ,
Macarius