This is functioning as intended. I understand the request you have. However, in order to make the items less exploitable for free respecs, the nodes removed needs to be deterministic.
Recording the order in which nodes were placed and removing them in that order brings multiple new problems.
We will keep an eye on feedback regarding the system to see if steps need to be taken. So far, we are quite happy with it.
Note: I have moved this to the feedback and suggestions section.