AASTeX 6 is built on the RevTeX package, version 4.1, which is sourced in our adoption of emulateapj in 2015. revtex-4.1 is an outdated package, which is a fact that is leading to an increased number of conflicts with both core- and contributed-latex packages. This issue has spread to a core functionality: linking floats and equations with \label{} and \ref{}.
If you see the warning, "Suppressing link with empty target" thrown by hyperref, and you find that none of your \label{} and \ref{} links are appearing in your compiled PDF then the error is due to a conflict between revtex and latex.
AASTeX 6is built on the RevTeX package, version 4.1, which is sourced in our adoption ofemulateapjin 2015.revtex-4.1is an outdated package, which is a fact that is leading to an increased number of conflicts with both core- and contributed-latex packages. This issue has spread to a core functionality: linking floats and equations with\label{}and\ref{}.If you see the warning, "Suppressing link with empty target" thrown by
hyperref, and you find that none of your\label{}and\ref{}links are appearing in your compiled PDF then the error is due to a conflict between revtex and latex.One workaround can be found at https://github.com/latex3/hyperref/issues/284