调用TMDB API成功后Glide无法在RecyclerView的ImageView中加载图片求助

我已成功完成API调用，除图片外其余所有内容均可正常展示。

适配器代码 #

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.recyclerview.widget.RecyclerView
import com.bumptech.glide.Glide
import com.example.moviespotter.R

class MoviesAdapter(val movies: List<Result>): RecyclerView.Adapter<MoviesViewHolder>() {
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MoviesViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.movie_item, parent, false)
        return MoviesViewHolder(view)
    }

    override fun getItemCount(): Int {
        return movies.size
    }

    override fun onBindViewHolder(holder: MoviesViewHolder, position: Int) {
        return holder.bind(movies[position])
    }
}

class MoviesViewHolder(itemView : View): RecyclerView.ViewHolder(itemView){
    private val photo:ImageView = itemView.findViewById(R.id.movie_photo)
    private val title:TextView = itemView.findViewById(R.id.movie_title)
    private val overview:TextView = itemView.findViewById(R.id.movie_overview)
    private val rating:TextView = itemView.findViewById(R.id.movie_rating)

    fun bind(movie: Result) {
        Glide.with(itemView.context).load("http://image.tmdb.org/t/p/w500${movie.poster_path}").into(photo)
        title.text = "标题：" + movie.title
        overview.text = movie.overview
        rating.text = "用户评分：" + movie.vote_average.toString()
    }
}

暂未定位到问题根因，程序运行无报错，直接访问拼接后的图片URL可确认图片本身有效，未发现明显异常。

布局文件中ImageView配置 #

<ImageView
                android:layout_width="match_parent"
                android:layout_height="200dp"
                android:layout_centerHorizontal="true"
                android:id="@+id/movie_photo"
                android:contentDescription="电影海报" />

初始运行效果截图 #

更新内容 #

添加占位图后，占位图可正常展示，调整后的Glide加载代码如下：

Glide.with(itemView.context).load("http://image.tmdb.org/t/p/w500/rjkmN1dniUHVYAtwuV3Tji7FsDO.jpg").placeholder(R.drawable.space_dog_laika1).into(photo)

添加占位图后的运行效果截图 #

内容的提问来源于stack exchange，提问作者petestmart