I have the exact same problem as this post here back in 2014: Dynamic objects in reflection captures - Content Creation - Unreal Engine Forums, but the thread died off without any solutions.
I currently have a movable door that leads to another room, and a shiny wall on the opposite side of the door that reflects the doorway, but not the door itself, so that if the player looks at the wall, they can see into the next room because the movable door (which is currently not moving because it’s closed) is not captured in the reflection capture. How can I capture the door in the reflection capture so that the player can’t see straight through the door into the next room?