Plane: BUG with auto_state.checked_for_autoland

[liang-tang]

Bug report

Switch AUTO->RTL again an again, because checked_for_autoland always set to false when change mode

bool Mode::enter()
{
    // cancel inverted flight
    plane.auto_state.inverted_flight = false;

    // don't cross-track when starting a mission
    plane.auto_state.next_wp_crosstrack = false;

    // reset landing check
    plane.auto_state.checked_for_autoland = false;

Version
4.0
Platform
[ ] All
[ ] AntennaTracker
[ ] Copter
[*] Plane
[ ] Rover
[ ] Submarine

Airframe type
What type of airframe (flying wing, glider, hex, Y6, octa etc)

Hardware type
What autopilot hardware was used? (Pixhawk, Cube, Pixracer, Navio2, etc)

Logs
Please provide a link to any relevant logs that show the issue

[IamPete1]

maybe related to #18496 ? In that case you can get stuck switching modes endlessly if you have a DO_LAND_START before a RETURN_TO_LAUNCH waypoint.

[AlSharji0]

Hi all,
This is my first contribution to ArduPilot, I've opened PR #30513 to address this issue.

I'd really appreciate any feedback or suggestions for improvement.

Thanks!