You can google it.I'll take your word for it that we did

US left Afghan airfield at night, didn't tell new commander
Afghan military officials say the U.S. left Afghanistan’s Bagram Airfield after nearly 20 years by slipping away in the night, without notifying the base’s new Afghan commander.

Right, I don't know the details either. I do know it was a planned action.I have nowhere near enough info to understand why we would do that. I don't know is my answer.
I don't think it did "go to plan" as hoped for, which is that the Afghan forces would at least act as an absolute bare minimum as a speed bump while we got our forces out. But the other guys get a vote too, and the Taliban and the Afghan government(s) voted to collapse. We responded. There was a reason we had forces staged off the coast and in the Gulf for a quick reaction. Hope for the best, prepare for the worst.Now your turn. Why would Biden lie in a written speech on national TV and say this did not go according to plan if it did in fact go to plan?
The very worst hasn't happened, by the way.
I'm not saying the closing game here wasn't fubar. I am saying that these sorts of things are hugely unpredictable. "Gradually, then suddenly" to paraphrase Hemingway. The fall of the Berlin Wall. The fall of the Soviet Union. The fall of the Taliban 20 years ago. ISIS coming into Iraq. And now the fall of the central Government of Afghanistan. They didn't even fight. WTF?
The sneaking out of Bagram in the middle of the night was a big "tell" that we considered them unreliable partners, and that our departure was going to be weird. Who does that to an "ally"?
But the leaving out of the Afghan government itself in negotiations with the Taliban set the stage. who does that to an ally? What sort of loyalty do you think they had with us after they got to watch the Doha negotiations from outside? Think they saw us as unreliable partners? Think the Taliban didn't use that as a huge wedge? They're not stupid. We already killed the stupid ones.
I'm 1000% sure the current hot-takes are all wrong, though. They always are.