I'm using the Bulk Rail Loader mod and connected two unloader with red wires.
If using the blueprint as a single blueprint (without a book) the circuit connection will stay (works as intended).
After putting the same bp in a blueprint BOOK: placing the ghost still shows the logic wires, but after the bots placed them, the wires are lost.
Example:
Single Blueprint:
Blueprint in a book:
I assume it has something to do how the mod implements the loader (probably multiple entities), but I would not expect any difference in using a bp in a book or without it.
Thanks for looking into this

Have a nice day!