If a static object has 'Use Complex collision as simple' set as its collision type, it'll collide with a player but will not collide with objects that are dynamically simulating physics.

Steps to Reproduce

1. Create a new project with starter content using the First Person Shooter template
2. Create a new blueprint based off the actor class
3. Add a static mesh component to the new blueprint
4. Apply a static mesh that uses 'Use Complex collision as simple' (i.e. Floor_400x400)
5. Place an instance of the blueprint in the level and be sure that 'Collision Preset' is set to 'BlockAll'
6. Place one of the FirstPersonCubes in the level over the new blueprint's instance.
7. Start PIE
8. Notice that the cube falls through the new blueprint instance

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ComponentUE - Simulation - Physics
Affects Versions4.8
Target Fix4.8
Fix Commit2560854
Release Commit2562288
CreatedMay 20, 2015
ResolvedMay 21, 2015
UpdatedApr 27, 2018