The wormhole I'm familiar with was created by aliens that somehow set up a stipulation that only creatures with a particular genetic code could pass through it. Anything else just bounces right off. If a wormhole is what got us here, though, there's no way to know if it's got any quirks like that until we find it.

[It also straight up might not be a thing, but it's all he's got to go on right now.]

Hm. Interesting... You think that might have something to do with one of them lying all the time? [Which is some bullcrap if you ask him.] That might just be another fun twist, though. Ugh.