Auto save unity scene/assets when playmode started. Works fine if crash happened. Optional: You can place this C# file to Editor folder in Assets

AutoSaveExtension.cs

#if UNITY_EDITOR

using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine.SceneManagement;

[InitializeOnLoad]
class AutoSaveExtension
{
    static AutoSaveExtension()
    {
        EditorApplication.playModeStateChanged += OnPlaymodeStateChanged;
    }

    private static void OnPlaymodeStateChanged(PlayModeStateChange playModeStateChange)
    {
        if (IsStartingPlaymode())
            Save();
    }

    private static bool IsStartingPlaymode()
    {
        return EditorApplication.isPlayingOrWillChangePlaymode
            && !EditorApplication.isPlaying;
    }
    private static void Save()
    {
        EditorSceneManager.SaveScene(SceneManager.GetActiveScene());
        AssetDatabase.SaveAssets();
    }
}

#endif