Good ole fashioned patellar tendinitis, such a pain. Had it in my right knee during a heavy lifting cycle in the off season for triathlons. It’s going to sound so weird, but make sure you’re landing your feet directly under you, that’s going to be super important as you’re not landing on your joints/tendons wrong. Treadmill and a phone can show you land. What helped me was reducing weekly volume, and cross training swimming and the elliptical (it sort of mimics how running is, super low impact too.)
I hope it clears up for you though! It’s not even a terrible pain, it’s just an annoying one, like a gnat at a barbecue.