I feel your pain. I too have a decent range practice area for wedges and chipping. I play games, vary my practice, and do well. Then on course I get all weird over the ball and hit awful shots. Really been a round killer for me recently.
I have noticed at the public courses I play that the lie you get 10-20 yards off green isn’t always very good. It’s often sparse grass and dirt, not a true grassy rough. So hitting That shot after practicing on various fairway lies and rough lies isn’t helping.