Feeding Interpolative non-additive Data into Make Dynamic Additive gives a Warning "Trying to play a non-additive animation into a pose that is expected to be additive in anim instance"
AnimBlueprintLog: Warning: Trying to play a non-additive animation 'name of the animation' into a pose that is expected to be additive in anim instance 'refererence of the anim instance'
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Result: Warning: Trying to play a non-additive animation 'name of the animation' into a pose that is expected to be additive in anim instance 'reference of the anim instance'
Expected: No warning.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-75817 in the post.