Halo infinite tech preview is great but have some small bugs. One of them is the lighting on some maps. If you get hug a wall the lighting sometimes changes for me. Also the audio when you join in the middle of the game is a very off. Other than that great game!
If you are encountering issues during the flight, please refer to the known issues list on https://aka.ms/HaloSupportInsider and submit tickets for issues not present.
For general feedback that is not a bug or issue, feel free to use the pinned feedback threads at the top of the Halo Infinite forums
https://www.halowaypoint.com/en-us/forums/29568daf8cd14083bd1b70a810bf3581/topics