Hi.
First I wanted to report a bug that locked pipes ignore upgrade planner, but then I saw the problem.
So, now it is a feature request.
Would it be possible to keep the pipe configuration when a pipe is replaced? Now, when a pipe (of the other type or the same) is placed on an exiting locked pipe, it reset the configuration and connects to everything. It may be a nice additional way to reset the pipe, but with multiple tier of pipes "keep the configuration" behavior may be better. It would also allow for upgrade planner to work on them.