Marginalization fail IncrementalFixedLagSmoother about gtsam HOT 3 OPEN

I am also having this problem. Could you share your fix?

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You can find my fix here @sanderscience : #1639

It's one line of code but rather a hotfix.

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Hi, thank you for sharing your work. I am trying to use IncrementalFixedLagSmoother in my project. But I met some error when I run my test rosbag. I set the lag time to be 3.0. And I built gtsam 4.2.0 with code
additionalKeys.insert(clique->conditional()->frontals().begin(),
clique->conditional()->frontals().end());
in IncrementalFixedLagSmoother.cpp. But my code still have errors.
#1746

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