Occasionally, when you cast Knit Flesh, you can get a "Resist!" proc and the heal-over-time portion doesn't trigger. It definitely seems to be linked to your actual Magic Resistance stat; I grabbed Ancestral Body Paint as a test and sure enough it started happening even more often. The small initial heal and debuff never fail to trigger. I have also yet to see any other self-buffs get resisted in this way, but I haven't looked extensively. This was already happening as of 1.07, but I hadn't figured out the cause at the time.
All dots seem to be able to be resisted at the moment, good or bad. Most other heals don't use dots. You can even eat a fairywodger and resist it's healing.
