Tile Map Component not rendering

I created a simple tile map in the Unreal Editor. I placed an instance of this tile map into an empty scene. I then created an Actor blueprint, with a tile map component within it, with the same tile map assigned to the component.

I set up a camera to show both of these tile maps on the screen. When I play the game in the editor, everything works fine, both are visible. But if I package for Mac, or hit the Launch button, only the raw tile map is visible. The one within the blueprint component isn’t rendering.

Is this a bug? Or am I doing something wrong? I have been able to reproduce this with a new empty project containing nothing but the above two actors and a camera.

That’s new behaviour in 4.8 I filed a bug against both of these here: Tile map component not rendering - Programming & Scripting - Unreal Engine Forums

This is a bug still in 4.8.

It only occured when you put TileMapComponent to an actor and then drag it into Scene.
When you save the level and reopen it. The TileMapComponent’s Tile Asset Property will become a non-exist Asset. Your setting completly gone. So it is black.

https://answers.unrealengine.com/questions/245700/paper-2d-tile-map-components-tile-map-asset-proper.html

https://forums.unrealengine.com/showthread.php?73679-Bug-Paper-2D-Tile-Map-Component-s-Tile-Map-Asset-Property-won-t-save