\documentclass{article}
\usepackage{fontspec}
\setmainfont{junicode}
%\setmainfont[Ligatures=Discretionary]{junicode}
\begin{document}
fifty
nifty
activity
\end{document}
This will produce fty ligatures, but not a ty lig. in the last word.
Commenting out to use ‘discretionary’ ligatures will enable ty but disable fty. How can I enable both?


