It appeared that locating these small recon drones was an issue, what has changed?
My guess is Ukraine can intercept and triangulate the signals that the drones transmit.
Applying lessons learned to Tactics, Techniques and Procedures (TTP) can make a lot of difference. Remember that many of these systems are new to the personnel operating them, and there are a large variety of systems. That also applies to the manufacturers providing software tweaks (or merely technical/operator advice) on the radar signal processor and track processor, based on real world performance. New radar/EW systems integrated into the Integrated Air and Missile Defense system could also make a significant difference. If the new Patriot battery was placed in the south, it will improve coverage there.