When I export a Plot in Mathematica as a PDF characters in PlotLegends and AxesLabels get replaced by other characters.
My code:
plot = Plot[x, {x, 0, 1}, PlotLegends -> {"T = 1"}, AxesLabel -> {"p / GeV", "M in GeV^-1 "}]
Export["/home/test.pdf", plot, "PDF"]
Export["/home/test2.png", plot, "PNG"]
This code gives me wrong characters in the pdf file, and right ones in the png file (the "=", "-", "/" are wrong).

VersionNumber: 13.1 on Linux

13.1.0 for Microsoft Windows (64-bit) (June 16, 2022)Wolfram Engine, and I see no problems here. – rhermans Jan 30 '23 at 15:55