VTOL Oscilations when transition from FixedWing to Multicopter in normal WP

Hello,

Then he transition from Plane to Copter to do the deliver, but it’s when it finishes transitioning and starts descending that the oscillations start. The transition from Plane to Copter for the QRTL does it correctly too, and it descended to the ground without oscillations.

Do you know why it oscillates when descending like Copter in normal WP?

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Thank you,

Eduard