I tied casting Benevolence on a sarnak champion in Burning Woods and it become dubious. I then conned every sarnak I saw up to the fort and they were all dubious, as it should be. I then relogged at the fort to reset everything back to threatening. I cast Benevolence again on the closest sarnak, a sarnak knight which also became dubious. However, I then ran into other sarnak which were still threatening:
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I had the same problem with hornets. I did Benevolence on one type and was still threatening on another.
The first time I tried this I had to cast Benevolence on at least 3-4.. maybe 5 different types of sarnaks in Burning Woods because I kept running into ones that were threatening.