Release notes pasted below. There's also a Laminar blog post about the release available at https://www.x-plane.com/2026/04/whats-new-in-12-4-2/

Public Beta 12.4.2-R1
(Yes we know it's called R1... this is still a Beta release! Please check the beta box or use the beta_channel)

ATC

• Fixed a crash when entering a flight plan on the ATC screen (XPD-17948)

Avionics

• Fixed a crash when using a secondary monitor for avionics display, such as the G1000 PFD

Graphics Engine

• Fixed an issue where aircraft LODs (Levels of Detail) were not switching correctly with distance, causing only the highest-detail model to render at all ranges and leaving visual artifacts at maximum distance (XPD-17984)
• Graphics engine improvements, including updates to the VMA allocator and Vulkan transfer coordinator for better performance and stability (XPD-17946)

Flight Model

• Loading an in-flight situation file is now significantly more stable. Aircraft previously exhibited pitch oscillations and erratic behavior when resuming a mid-flight save (XPD-17832)

Scenery

• Nice Côte d'Azur Airport (LFMN) - improved custom airport scenery with enhanced detail and accuracy. Many thanks to Matthias Gerstberger for this update!
• Windsock indicated airspeed accuracy - windsock deflection now more accurately reflects actual wind conditions (XPD-17994)
• Updated Global Airports with the latest approved submissions from the X-Plane Gateway.

User Interface & Controls

• Fixed a crash when displaying "All Planes Altitude" in the Data Output window (XPD-17962)
• Added a dedicated pause/freeze command for Tobii Eye Tracker users (XPD-17867)
• Fixed the joystick configuration for the Honeycomb Echo Controller, as four buttons were not registering correctly and are now fully functional (XPD-17983)

Also, a separate post about an X-Plane Gateway update has been posted at https://developer.x-plane.com/2026/04/x-plane-gateway-update-12-4-2-april-2026/

Edited April 15Apr 15 by Malaromane

I've patched up but haven't had a chance to take it for a flight yet. Really hoping that the "...dedicated pause/freeze command for Tobii Eye Tracker..." means that when I pause the tracker, the view will remain where I paused it rather than recentering.

Nice, now I’m waiting for FF 777 for XP12.