Disappering Legend Guide?

Don’t know how often this happens, but on runs after recieving the Perfect Legend Guide,
you should be able to access it in the Stats menu, right?

For me, it’ll randomly disappear as if I never achieved it in the first place.
Does this happen to anyone else? And is there a way to fix this? I’ve experienced this issue
so far in The Prodigy and The Hero Project, but haven’t checked for HeroFall.

I think it’s supposed to disappear. It’s been a while since I last played, but I’m pretty sure it says “Write this down now because it’s going to disappear!” or something like that. I play on my phone, so I just copy it to a note.