print debug to confirm the issue

src/modules/flight_mode_manager/tasks/Transition/FlightTaskTransition.cpp

@@ -94,6 +94,7 @@ bool FlightTaskTransition::update()
 
 	if (!_sub_vehicle_status.get().in_transition_to_fw) {
 		tilt_setpoint = computeBackTransitionTiltSetpoint();
+		PX4_INFO("tilt setpoint: %.4f", (double) tilt_setpoint);
 		const Vector2f velocity_xy{_velocity};
 		horizontal_acceleration_direction = -velocity_xy.unit_or_zero();
 

src/modules/vtol_att_control/standard.cpp

@@ -196,6 +196,7 @@ void Standard::update_transition_state()
 	const Eulerf attitude_setpoint_euler(Quatf(_v_att_sp->q_d));
 	float roll_body = attitude_setpoint_euler.phi();
 	float pitch_body = attitude_setpoint_euler.theta();
+	const float pitch_body_original = pitch_body;
 	float yaw_body = attitude_setpoint_euler.psi();
 
 	if (_vtol_mode == vtol_mode::TRANSITION_TO_FW) {
@@ -264,6 +265,12 @@ void Standard::update_transition_state()
 
 		q_sp.copyTo(_v_att_sp->q_d);
 
+		if (_time_since_trans_start < 0.05f) {
+			PX4_INFO("\n\njust started backtransition (t=%.4f)", (double) _time_since_trans_start);
+			PX4_INFO("pitch_body: %.4f", (double) pitch_body);
+			PX4_INFO("pitch_body orig: %.4f", (double) pitch_body_original);
+		}
+
 		_pusher_throttle = 0.0f;
 	}