This is so weird, but I found a way to temporary fix it. Just renamed the structure which was making troubles, “Fix Up Redirectors in Folder” (right click on the ■■■■■ with the structure): that was just in case, save everything and restarted the editor.
Now it doesn’t unplug the nodes and (most important) it also compiles during cooking. And yes, I was able to rename back the structure, and after restarting the editor once again it continues working well.
Again, it’s weird, it’s a bug. Hope we get any answer from Epic, because this is not the first time I have this kind of problems with structures and nodes. At least now we have some walkarounds here 