Sunlight clips through the blocks even if it is blocked.
Steps to reproduce
1:import the mcpack from the attachments
2.create a world with render dragon features for the creator experiment toggle enabled(flat world for speed) and enable the mcpack in world settings
3.create a room that is blocked from the sunlight (from my testing it is best to use 2 block height rooms)
4.enable the deferred technical preview in video settings
5. set time to day using the time command
6. go to corners to experience the visual glitch.
Note: you can try during the day, at sunrise and at noon.