What's Changed

• [BACKPORT 1.16] Correction of routing issue of mavlink parameter messages to CAN nodes by @dakejahl in https://github.com/PX4/PX4-Autopilot/pull/25658
• [BACKPORT 1.16] serial: nuttx: revert tcdrain back to fsync by @dakejahl in https://github.com/PX4/PX4-Autopilot/pull/25657
• [BACKPORT 1.16] mission: delay until: mark next setpoint invalid by @dakejahl in https://github.com/PX4/PX4-Autopilot/pull/25729
• [Backport 1.16] modules/navigator: Fix position setpoint update logic in Mission RTL by @msberk in https://github.com/PX4/PX4-Autopilot/pull/25861
• [Docs] [Backport 1.16] flight_modes_fw/return.md: remove warning about now-fixed RTL bug by @msberk in https://github.com/PX4/PX4-Autopilot/pull/25869
• [BACKPORT 1.16] drivers/gps: RTCM injection fixes by @dakejahl in https://github.com/PX4/PX4-Autopilot/pull/25862

Full Changelog: https://github.com/PX4/PX4-Autopilot/compare/v1.16.1-rc1...v1.16.1-rc2