Your question is Feature Selection Surprises. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
A data scientist built a logistic regression model by taking the top 20 features from a random forest and adding them to a main-effects-only logistic regression model; surprisingly, the top feature from the random forest was not statistically significant; provide at least two reasons.