A self-destruct for Cities: Skylines mods, as it fails to call "OnReleased" when a mod gets reloaded.

SelfDestruct.cs

using ICities;
using System;
using System.Linq;
using System.Reflection;

namespace SelfDestructor
{
    public static class SelfDestruct
    {
        private static bool SelfDestructExecuted = false;

        public static void SelfDestructCall(ILoadingExtension currentInstance)
        {
            if (currentInstance == null || SelfDestructExecuted) return;

            SelfDestructExecuted = true;
            currentInstance.OnLevelUnloading();
            currentInstance.OnReleased();
        }

        public static void DestructOldInstances(ILoadingExtension currentInstance)
        {
            var targetType = typeof(SelfDestruct);
            var currentAssemblyName = Assembly.GetAssembly(targetType).GetName().Name;
            var assemblies = AppDomain.CurrentDomain.GetAssemblies().Where(a => a.GetName().Name == currentAssemblyName);
            foreach (var assembly in assemblies)
            {
                var oldInstance = assembly.GetTypes().Where(t => t.Name == targetType.Name).FirstOrDefault(); // Get old instance.
                if (oldInstance == null || oldInstance == targetType) continue; // Skip current assembly.

                var selfDestructMethod = oldInstance.GetMethod("SelfDestructCall"); // Find self destruct.
                if (selfDestructMethod == null) continue; // No self destruct.

                selfDestructMethod.Invoke(null, new object[] { currentInstance });
            }
        }
    }
}