The Painted Bird (2019)
Arty B/W Czech film about a jewish boy trying to find his way home from an unnamed E. European location in the closing stages of WW2, after his aunt (guardian) dies and he accidentally burns her and the house to the ground. Features a man being eaten alive by rats, a woman having sex with a goat, paedophilia by members of Catholic Church, and a ferret being burnt alive. There were probably other horrific scenes but I fell asleep in the middle. The cinematography is awesome.
Apparently audiences walked out of cinemas. It's not clear whether that was because of the demanding content (it's not actually very graphic) or because it's three hours long with about ten words of dialogue throughout (the boy never speaks).