Featured Images most often doesnt appear

I recently facing a problem that never occure before. When i open add new post page most of the time Featured Image option doesnt appear.However if i keep refreshing the webpage, sometimes Featured Image appear.

And also i would like to inform that if i open it on mozilla, the chance of Featured Image appeared is more often. If i open on chrome / google edge, the featured image is rarely appeared.

Topic bug post-meta errors posts menus Wordpress

Category Web

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