I always assumed it was Rey who triggers R2’s wake.
Here’s another plothole for episode 4: if Leia knew they had a tracking device on the Millenium Falcon, why did they go straight to the rebel base? Why not go to some moon, rendez vous with some rebels and use the MF as a lure later on.
According to the people who made the movie, you’re wrong. But I don’t blame you for assuming that, because the movie didn’t make their intentions clear. TFA is kind of vague about a lot of stuff. I don’t really understand why Leia’s forces are called The Resistance and not simply “The Republic Army.” The movie doesn’t really make it very clear which force is dominant in the galaxy, First Order or New Republic/Resistance. Do a few searches on the internet, you’ll see a lot of people were confused about various things in TFA.
Your “plot hole” about the tracking device isn’t the same thing because ANH isn’t made confusing because they don’t address why they don’t stop to do something about it. It can easily be explained - Han may not believe her about the tracking device; Leia isn’t 100% sure there is a tracking device; if they stop somewhere, they may not be able to contact the rebels and arrange a meeting before the Death Star catches up with them, etc. Either way, it’s a minor minor detail, and what they’re planning on doing (beating the Death Star to Yavin, giving the plans to the rebels to find a weakness, launch an attack) works and it makes sense. The vagueness in TFA actually makes parts of the story confusing, and people walked away with different ideas than what was intended by the filmmakers.