"Не удалось удалить видео. Пожалуйста, попробуйте снова." Doesn't work in my watch later playlist.

It's best to use CSS selector to find the button instead of checking the text inside. I fixed it with this piece of code:

                await new Promise(resolve => setTimeout(resolve, 20)); // wait 20msconst removeButton = document.querySelector('#items > ytd-menu-service-item-renderer:nth-child(3) > tp-yt-paper-item');let removed = false;if (removeButton) {removeButton.click();removed = true;}if (!removed) {alert('It was not possible to delete the video. Please try again.');}

excellent, fixed) I'm not a programmer and didn't figure out how it works, I just fixed it in gptchat until it worked for me without any problems, and decided to share