Hmm Yeah that all appears correct. I received an email back from another person experiencing the cooking problem and here is how he said he got it working in addition to my 3 steps. So DON’T actually delete something, he is simply saying he click delete on the file in order to get the pack to recognize that some files have been updated. Basically the main point here is that the vine spline and the tree root spline need to be recompiled and saved and everything rebuilt after you delete the things that I mention in the pictures. So here is how he got it to do that.
"Hold the phone I just figured out the trick. What I need to do to get it working in addition to your 3 steps is, open your demo scene, attempt to force delete the tree-twist-data, at which point it comes up with an error window saying its in use or something- say ok. I then open my scene, which then unreal asks to save 2 files (sorry I didn’t write down what they were) say ok. Now when I package my scene it works!
Thanks for the fix! If anyone else is having issues tell them to try what I just did to get it working."
Hope that helps