Interactive Book - YouTube video not showing

Hello, I'm using H5P Interactive Book with Moodle 4 and there's a recurring bug happening with the Video content: sometimes, when I'm viewing the activity, the video does not show. Instead, the player only displays the message "this video is not available". However, If I refresh the page it works again.

I'm using YouTube videos with the "unlisted" setting, but I don't think YouTube itself is the problem, because I've been using videos like this for years and I've only noticed this bug in this current project.

I tried the following url variations to see if it fixed the issue:

• https://www.youtube.com/watch?v=XkmKEZwRE6s&list=PLqW-h9qIZNoX2jZYvg-cYm...
• https://www.youtube.com/watch?v=XkmKEZwRE6s
• https://youtu.be/XkmKEZwRE6s?si=ML-X8RnQTK7UvGoy
• https://www.youtu.be/XkmKEZwRE6s?si=ML-X8RnQTK7UvGoy

But it kept happening with all of them. These url are of one of the videos I'm using, BTW.

I'm using Firefox. Notice that it doesn't always happen: the videos work fine in, say, 9 out of 10 times. And when it bugs, It always works again when I hit f5. Yet, it's not ideal.

Any tips? Thanks in advance for the help.