Need fix in the next version
Multi-reflection is only available in image output, which means there is no multi-reflection effect in the real-time mode. Video rendering does not support multi-reflection at the moment, which will be optimized in the following updates.
Note: Multiple reflections are available between metal and mirror, while not supported between glass and glass.
Will be optimized in the following updates.
Please refer to FAQ and Solutions
The reflection between Glass to Mirror is not available now.