A workaround for 1247232

FixListFormatter.cs

using System;
using System.Linq;
using UnityEngine;
using UnityEngine.Localization.Settings;
using UnityEngine.Localization.SmartFormat;
using UnityEngine.Localization.SmartFormat.Core.Extensions;

public class FixListFormatter : MonoBehaviour
{
    void Start()
    {
        var formatters = LocalizationSettings.StringDatabase.SmartFormatter.FormatterExtensions;
        for (int i = 0; i < formatters.Count; ++i)
        {
            // If the name is null then create a new instance so we can get the default names and then copy it across
            if (formatters[i].Names == null)
            {
                // We only support 2 types of constructor. A default and one that takes a SmartFormatter.
                var type = formatters[i].GetType();
                var hasDefaultConstructor = type.GetConstructors().Any(c => c.GetParameters().Length == 0);
                var hasSmartFormatterConstructor = type.GetConstructors().Any(c => c.GetParameters().Length == 1 && c.GetParameters()[0].ParameterType == typeof(SmartFormatter));

                if (hasSmartFormatterConstructor || hasDefaultConstructor)
                {
                    var instance = hasDefaultConstructor ? Activator.CreateInstance(type) : Activator.CreateInstance(type, LocalizationSettings.StringDatabase.SmartFormatter);
                    formatters[i].Names = (instance as IFormatter).Names;
                    Debug.Log("Fixed null Names for" + type.Name);
                }
            }
        }
    }
}