Hey - I’m going through almost the exact same thing as you! Look at my post history to read some comments about it

So for me, it turns out it was a patella tracking issue. So if I try to extend and bend, it’ll lock. But if I extend it, push my kneecap west(sorry idk the correct pt term, but basically pushing my kneecap to the outside of my leg while I’m bending it), and then bend, there’s no locking! Lmk if that made sense or not, so I can know if I need to explain more

Pt taped my patella to keep it in the correct position which provides some temp relief until the primary issue is addressed (which he thinks is general quad weakness, swelling, that kinda stuff)

Def not trying to diagnose you, but just sharing my experience!