Here is an article from AP written ten years later, essentially saying that the Chinese based their J-20 stealth fighter on the pieces of the F-117 laying on the ground in Serbia:
https://www.theguardian.com/world/2011/jan/23/china-stealth-...
Chinese stealth fighter jet may use US technology
China may have bought parts of US F-117 Nighthawk shot down over Serbia in 1999, say experts
https://archive.org/details/ufintsev-method-of-edge-waves-in...
Wiki link about 117 development that mentions the work by Pyotr Ufimtsev.
https://en.wikipedia.org/wiki/Lockheed_F-117_Nighthawk#Devel...
Oh and it's not like that was the only time poor recon resulted in bombs dropped in another place during the intervention. The execution of it is certainly not a high in NATO's history.