I first tried with copying, and when I saw the unexpected behaviour, I tried the renderer on its own.
It seems to only be affecting links with a search query. I'll give you one of my exact links, and if you don't see anything suspicious with this in your test, then I'm going plugin-huntin'!
[[books/mg/4?s[]=man,+to+deserve+the+name,+must+be+educated+to+understand+the+Absolute+Truth.#id9|Ch. 4]]