October 2025 (2025-10) – PX4-Autopilot: Delivered a critical correctness patch for ADSB conflict detection. Fixed a bug where the vertical separation check incorrectly reused the horizontal separation parameter, causing altitude differences to be evaluated against the wrong threshold. Implemented a one-line change to use vertical_separation for altitude checks, aligning the detection geometry with the intended cylindrical (hockey puck) model. This patch enhances ADSB safety and sensor fusion reliability with minimal risk surface. Commit 71f56df23b737a389c5c6f5753b5f890c42bfd91 is the primary reference and was validated through code review; existing unit tests pass, though they do not exercise differing parameter values. Future test improvements are recommended to cover parameter drift.