@Octavian20604 Thank you for testing out our insider builds! I was unable to reproduce the issue on my end using the current insiders dev build. However, I can see that exact error screen if I disable cookie access for that website and your screenshot indicates you have not allowed YouTube to access your cookies.
Go to settings
> Site Permissions
Toggle on Allow sites to save and read cookie data (recommended)
If this problem presists, please let us know and we will follow up & try to gather more details to help us debug your problem better. Thanks!