Visual bug: Item disappears from watch history when adding another play

I was exploring a particular section of my watched history tonight, noting that some movies with 1 play needed extra history entries. Since I know I’ve watched them multiple times, but not when, I am using “Unknown” watch date for this.

After adding an extra “Unknown date” play, I noticed that the history item disappeared from the page. It came back after refreshing, so it’s just a visual bug, but it’s disconcerting nonetheless.

• Click the “✓ 1” indicator on a movie

• Choose to “Mark as watched again”

• Click “Unknown date”

My preferences say to prompt for a rating, and the site does so. But behind that dialog, the movie is now gone from the page until it’s reloaded.