So I've seen this issue come up a few times in the comments section, but no responses, let alone answers.

On the Engram list, even after you've learned all prerequisites for the glass stairs, it still won't let you learn them. Another item in the ARK vanilla version is like this, where 1 of the needed engrams wasn't listed in the description. I was wondering if maybe this issue is kind of the same thing. I've learned all other glass/metal engrams, but stairs still won't do anything. Slightly ♥♥♥♥♥♥♥ annoying. Anyone know how to solve this?