There're 3 layers in the RSC module graph: server → client → action. "Action" means that a Client Component re-enters the server layer by importing a file with `"use server"`, and it should behave the same as the server layer but you can't enter the client layer again (hence we have a 3rd layer name).
Since the action layer has the same behavior and module resolution rules, it should be bundled just like the server layer.
Closes#50658. Originally the issue was that `auth/next` isn't being bundled on the action layer, and it has the async local storage imported. Because of that, that storage comes from node_modules instead of the server bundle.
fix NEXT-1290
46981388aa