Diacrtitics change ΔX between Glyphs 2 and Glyphs 3

[khaled (Khaled Hosny)]

With Sudo font, I can confirm it is a LaTeX (or rather luaotfload) bug when not using HarfBuzz:

\documentclass{article}
\usepackage{fontspec}
\newfontfamily\sudo{Sudo-Regular.ttf}
\newfontfamily\sudohb{Sudo-Regular.ttf}[Renderer=HarfBuzz]
\begin{document}
{\sudo p^^^^0304,}\par
{\sudohb p^^^^0304,}
\end{document}