A "No humans" pattern in ai generated images

Recently I was browsing through some ai filters on snapchat and I came across this one filter that supposedly takes real images and converts it into "AI Anime art". I played around with the filter until I got one result with "No Humans" text on an anime character felt kinda weird and funny at first but after 4 or 5 more prompts, same this came up with a different character. After some days I used the filter again and the same text came up again. I wonder what may be causing this coherent text to form in the art generated. My assumption is that perhaps the creator has a checking system that checks for human figures in the prompt image(also the "no humans" output's prompts didn't have any human figures either) What are your speculations and opinions?