What is this tinypiece that fell out of xbox controller circuit board?

Have had something stuck under my xbox one controller's left bumper for some time now making it hard to use. Finally decided to open it up to blow it out as I could not get it out while it was closed up. I tried not to mess with anything else bc I know how easy it is to ruin a controller from doing this but once I finished cleaning out left bumper and started to put everything back together, I noticed a very small white piece with a couple of prongs sticking out of its sides had fallen out of my controller and I dont know how it happened or where it came from specifically. It definitely looks like it came out of the circuit board. turned on my controller and my left bumper was fixed and it seems that all the buttons work. But I'm very concerned about this small piece? Can anyone yell me what it is? It's about the size of a grain of rice and a rectangular box shape