When you upgrade to Mesa 22 and run on an Intel Iris graphic card you can run into a bug that suddenly no headline content is rendered anymore. This bug seems to be in WebkitGtk 4.0 up to 2.36: https://bugs.webkit.org/show_bug.cgi?id=238513 and probably will be solved in an upcoming WebkitGtk release.
Workaround
As a workaround set the environment variable WEBKIT_DISABLE_COMPOSITING_MODE=1 e.g. in your ~/.profile. Alternatively downgrade Mesa.