Is mistform working as intended?

[Tuidjy]

I was under the impression that one gets afflictions only
when the blow inflicts significant damage. But I have
had a lot of commanders getting the chest wound affliction
while the misform spell was active. The misform was not
broken in the process, i.e. it was still active afterwards,
and the blows in question inflicted no more than one point
of damage. The 'chest wound' may be a coincidence or a
trick of the random number generator, but I think that
it makes sense that misform should prevent afflictions
unless it is taken down.