Do you have flaking like that with Formlabs resins ? Anyhow, it looks like an issue on the optical path of the laser. Check the bottom of the tank, the optical window, the mirror at the bottom of the printer and ultimately contact Formlabs to get the instructions to clean the galvo mirrors.
You could print this and post the results, it’s a great torture test to assess if the laser is obstructed in any way.