Unusual jitter when switching to LOITER mode

When the WP_LOITER_RAD radius is set to be greater than 100 meters, when switching from cruise mode to LOITER mode, the whole machine will quickly tilt to the left. Is this action necessary? . This jitter does not occur when using the default 60m radius.
This phenomenon can be reproduced in the simulator, because the aircraft in the simulator is relatively heavy, the jitter is not fast. If tested on a normal foam plane or a 3D plane, this jitter would look weird as it doesn’t seem like a necessary motion.

This phenomenon only occurs when the circle radius is set relatively large. According to the conventional logic, the aircraft only needs to slowly tilt to the right until it is tangent to the circling radius and then maintains the tilt angle, and the whole process does not need to tilt to the left.