Hello,
Byron here from the technical support team. I see a similar error in the Problems section of the code editor when testing from my workspace, but I also see that the tag is rendering when I preview the link or send a test email.
It looks like we may need to pass this issue over to our engineering team for review to see why that is being reported as a problem in the editor. In the meantime, can you confirm that the link id is being included and that your universal links are navigating and tracking as expected?