Just personal experience. It lets you do it, it doesn't let me do it. What kind of source do you want, like a screen recording?
Could also be context. iOS's keyboard absolutely censors the word "yourself" if the previous word is "kill". You can trace type "yourself" in many other contexts, and you can trace type "kill" in some (not all), but if that was your last word, "yourself" will have to be tapped out, one letter at a time. There are a few examples of it censoring things like that. (And good reasons, sure, but if you're not bullying someone and maybe you're in Writer or a text editor writing a story, it's kinda weird.)