Incorrectly rendered umlauts

[efaulhaber]

In this example PDF the umlaut is not displayed properly (dots too far left) in PDF.js (using Firefox 79.0).

This is how it looks:

This is how it is supposed to look (screenshot from SumatraPDF):

This happens to several umlauts in PDFs generated by LaTeX using this font (lato) and T1 encoding.
This PDF was generated with the following code:

\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[defaultsans]{lato}

\begin{document}
    \textsf{ö}
\end{document}