Error velocity variance

This aircraft has a pitot tube. It can exhibit high vertical velocities in near-vertical climbs. Today I observed “Error velocity variance” in Yaapu telemetry. I wonder if these errors come from difference in GPS horizontal velocity and pitot tube readings. I can’t immediately see them in the log. I wonder what calculations these errors affect, and how to assuage them.

Log: https://github.com/arikrupnik/ardupilot-config/raw/master/logs/FIXED_WING/16/2023-05-29%2011-19-41.f30fj.bin