Your ROOT_URL in app.ini is https://gitea.jennalody.de/ but you are visiting https://gitea.jenslody.de/jenna/gnome-shell-extension-panel-osd/blame/commit/6cab93b472821b7b382e1408aa543d2334b017bd/data/org.gnome.shell.extensions.panel-osd.gschema.xml.in
You should set ROOT_URL correctly, otherwise the web may not work correctly.