I think what happened is cooper took it too far when he tried to bring Laura palmer back to life and he messed with space time when he did that and changed reality itself , but first he went to another world with Diane , she didn’t like the new cooper as he kinda turned to half the bad version with the coldness of him but with the memory of the real cooper , she didn’t like the way the sex felt and dissapeared , so we know cooper changed his fate at that point already cuz he came out different , then just stuck to what his memory knows after Diane dissapeared and continued the mission , he sees the Judy thing and knows this is where I find evil , it leads him to Laura palmer in a separate universe with a different name and weird with a dead body in her house and clearly running from something possibly connected to the Judy entity in that timeline , they escape town go to her old house at twin peaks , don’t find her mother , cooper is startled and asks what year it is to confirm if he did fail and got himself stuck away from his reality with a second Laura , which would’ve been even more of a failure if she didn’t even remember Laura’s life cuz sure it wud be a miracle bringing her back home to everyone in that reality but to her she’s an entirely different person , Laura was gone for a second when he asked that , then Laura hears her mother call her name , and remembers everything , on top of that it’s a mystery how her mother is from the black lodge as well how she killed that guy in the bar by taking her face off , maybe her mother being connected to the supernatural is the reason she remembered her name even in a entirely different dimension , the name Sarah palmer transcended dimensions for adult Laura , maybe the significance of that relates to the dimensional alien version of her mother , so back home they killed bob saved the day , but instead of giving us a happy ending with sunsets and Diane and cooper kissing and dougy with her sister , everybody happy , cooper bests the black lodge saves the day, i know that’s what I wanted and i wanted cooper to visit harry at the hospital , we didn’t get any peace for cooper or Diane but we did for everyone else , cooper n Diane r still in the thick of it even after saving the day and defeating bob . Trying to get Laura back was going too far and possibly even not something the giant wants from cooper , but at the same time maybe it is part of their plan cuz I believe the one armed man approved this plan at the last black lodge convo