Is my Bok Choy healthy?

https://preview.redd.it/szuicue4b4ee1.jpg?width=908&format=pjpg&auto=webp&s=750770b2d83c5503001468e5e7adc7bc5ae61850

I have like 10 bok choy plants and they all look perfect except this broken leaf. Is this a pest? A disease? It looks like someone just physically tore this leaf but I want to make sure my plant is healthy.