It's not a bug. Let me try to explain.
LightRooms are mini projects, which would replace all lights and props at the scene.
They usually suit well for small character demonstration projects.
Some LightRoom presets include one or more prop such as backdrop, reflector, mask.. etc.
Applying a new LightRoom clears all existing props to ensure correct "room" setup that has nothing else to disrupt the original idea of the setup.
Reach targets usually props and once LightRoom preset is applied, they are gone from the scene, thus your character looses Reach targets.
Conclusion: Either apply LightRoom presets at the very beginning, or alternatively use Atmosphere presets, which would not clear props from the scene.