Found a tiny egg in the chicken coop?

Hello! 🙂

Our chickens tend to lay small eggs, but we've never had one this tiny before.

Three of our hens are currently clucking and are therefore sometimes stealing each other's eggs or sitting on other people's eggs, so I don't know if, and if so, which of our hens laid this egg.

Or maybe a bird flew into the coop and laid the egg there? (We have a lot of birds in our garden that eat the leftover chicken feed.)

Does it sometimes happen that chickens suddenly lay a tiny egg?

Answers would be very helpful 🙂