Hi,
Thanks for reporting this issue, I can reproduce it here when using the Select and Link tool. I'll pass it on to our development team for investigation. In the meantime, there are a couple of workarounds. You can cut the RCSpline modifier from the stack, use the Select and Link tool to create your hierarchy, and then paste the modifier back into the stack; alternatively, you can create the linked hierarchy using the Scene Explorer window instead. Both these seemed to work OK in my tests.
I hope that helps, please let me know if you have any further questions.
All the best,
Paul