Hi @WillK,
Thank you for getting in touch with your report. Please note that utilizing the Prefer File tag is a preference. In some cases where Roon detects an error in the tag field the software will revert to using Roon tags.
In this particular case the chance of errors seem more pronounced. I’m not saying that there are errors in your tags necessarily, but simply that the steps for synchronized lyrics upload could require a more rigid methodology.
Did you utilize a text editor to create your lyrics as encouraged by @Rugby in this post?