I am seeking the word that means something similar to "when you know something (such as knowing how to ride a bicycle) and you do not know what it is (or what it feels) like to not know it."
Examples may be:
0) When one has learned about a topic so extensively that explaining it to another person and not knowing what another person knows about that topic can be difficult. If this topic was programming, the person who learned so much about it may see many things on the computer in a completely different way than someone who knows very little about programming. Topics that could produce similar situations that can occur in every day life could be art, aviation, physics, and philosophy.
1) When one performs an activity so frequently or in such a way that attempting to understand why a person at a lower skill level doing it in a different way (for whatever reason) or explaining how to do what the performer is doing can be difficult. @ermanen's answer.
2) ~If a person was doing something (gaming, working out, eating with certain rules) so often, and that person expected others to do the same and could not understand why others do not do the same.
3) ~The state of nature.
4) "It’s not really possible to know how to ride a bicycle and not know what it is like not to know this, since nobody is born knowing how to ride a bicycle. If anything, you don’t remember what being unable to ride a bicycle is like. Seeing or hearing would be better examples: those of us who are born seeing/hearing simply do not know what it feels like to be blind/deaf. I don’t think there is a specific word for this state, though; ‘presupposition’ is one (well, several) practical outcomes of one aspect of this, but it doesn’t really fit as a description of the state itself." - @Janus Bahs Jacquet's comment.
5) "If it's a learned behavior, you've absorbed it, it's become instinctive, it's in your bones. If it's a part of you anyway, could you say you're consciously unconscious of it or even unconsciously conscious of it?" - @Leon Conrad's comment.
~ = maybe or similar, it may not be in the same exact term, however, adding in more examples may make it easier for some to connect the dots so to speak.