I once encountered this situation on a very big print. It may have been that the printer didn’t know the cartridge was low (maybe because we manually poured some resin out, which is something we don’t typically do but it could have happened), and it seemed to have realized it when the resin level wasn’t rising after several refilling attempts.
In this situation the printer threw a “cartridge empty” error and stopped. This was several months ago.
EDIT I just read that “end-of-print” errors due to level sensing and resin dispensing are being worked on and a first pass on these issues was released with the Aug 2018 update