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Unexpected LAND failsafe issued during RTL - AC 405

Hi,

Could someone help me please understand what went wrong and led to unexpected LAND during AUTO mission with on-board guidance support.

As you can see in the log i have ALL fail-safes disabled in order to fly long range auto missions.
Yet, during 10 waypoints completed on an AUTO mission, soon after GCS/onboad RPi triggered RTL, AC decided to switch to LAND (!) - based on EKF variance errors. GPS position and ALT were all perfect through and through so i find it strange that my operator controlled mission was interrupted, which in turn led to crash despite no failsafes configured.

HEX
AC 405
matek f765 wing

log https://drive.google.com/file/d/16yVEHQm_Ac-IgQJWRKmiL-jE7Fpu6GvU/view?usp=sharing

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