i was trying to create a drowned farm, so i have zombies that have been damaged by fall damage inside a water chamber, trying to turn them into drowned. when testing with different amounts of comparators to find the least amount i would need to convert them into drowned, might have created zombies on the verge of drowning, but died to fall damage instead and turned into drowned anyways. in this case, armoured zombies and those holding tools did not drop their items