Source maps not working?

[Quafadas]

In browser, I see this;

Could not load content for https://raw.githubusercontent.com/PurpleKingdomGames/tyrian/tyrian/src/main/scala/tyrian/TyrianApp.scala

I think it wants to target this;
https://raw.githubusercontent.com/PurpleKingdomGames/tyrian/main/tyrian/src/main/scala/tyrian/TyrianApp.scala

Not 100% clear on why. Laminar has a slightly different approach ;
https://github.com/raquo/Laminar/blob/23042136b18706068f7bbeb271bfaaf02e6eef1c/build.sbt#L100

Unfortunately, I'm too scared of SBT to put up a PR... and I have a history of trouble with source maps - so just noting everything I found in case it helps.