Rush SR - diagnosing issue - chain - Road America - Insta360x4

Hearing a click and/or something catching when heading to false grid. Just a quick video of us figuring it out what it was. Chain was wore down and some links almost broke. Glad we caught it.

[@ISpinUWin]

Curious how many hrs on the chain. Obvious when it was finally seen? Did it fail from being over tight or normal wear?