A bug occurred in content-scripts/website-context/youtube-features/appearance.js The bug is "API key not valid. Please pass a valid API key.". Extension App Management kept building bug logs, so I temporarily wrote the following section, and the logs were not stacked.
if (xhr.readyState === xhr.DONE && xhr.status === 200) {
var response = JSON.parse(xhr.responseText);
id = response.items[0].snippet.channelId;
}
Please, Check the API key.