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.
Walters (2021): The Causal Interpretation of Two-Stage Least Squares with Multiple Instrumental Variables, American Economic Review, 111, 3663--3698
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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.