Small creatures are usually immune to Evards, but the resized models of Derro and Wild Dwarf (which are counted as small creatures) still get damaged by Evards.
The spell is likely triggering damage based on the model, not based on scaling size. One way to fix it might be to add immunity to the spell, for the specific races that are supposed to be small. Another might be to make dynamic models with the property of small, so that characters of these races are functionally small as well.
Derro/Wild Dwarf - Evard's damages small models
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Derro/Wild Dwarf - Evard's damages small models
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