Linear IV estimands can place negative weights on conditional LATEs under weak monotonicity with misspecified reduced forms due to homogeneity restrictions, but the interacted IV specification avoids this.
Lieli (2014): Testing the Unconfoundedness Assumption via Inverse Probability Weighted Estimators of (L)ATT , Journal of Business & Economic Statistics, 32, 395--415
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When Should We (Not) Interpret Linear IV Estimands as LATE?
Linear IV estimands can place negative weights on conditional LATEs under weak monotonicity with misspecified reduced forms due to homogeneity restrictions, but the interacted IV specification avoids this.