i have noticed on pc that when you are queued into a match thats already running due to a player dropping out before you. once loaded in the sound is missing almost all SFX
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