ScriptableObjects array of array is expanding on top of other fields in the inspector (2021.1.0f1)

[Reshima]

My ScriptableObject array field is expanding on top of other fields in the inspector. See screenshot below:

Code:

using UnityEngine;

[System.Serializable]
public class WorldZone
{
    public Transform[] prefabsGroup1;
    public Transform[] prefabsGroup2;
    public string name;
    public string description;
}

namespace ScriptableObjects
{
    [CreateAssetMenu(fileName = "WorldData", menuName = "WorldData")]
    public class WorldData : ScriptableObject
    {
        public WorldZone[] zones;
    }
}

[wang37921]

same problem