If you use the attached project, you can skip steps 1-5.
please find attached video for repro.
Exptected Result : NavMesh generated from box actor (Not from cylinder actor)
Actual Result : NavMesh generated from both box and cylinder actor. and cylinder's NavMesh located in wrong position.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-114671 in the post.