Icon missing in Panels

[Madave94]

Icons for panels are not shown. The icons are added the same way as for the operators:

class IAAPanel(foo.Panel):
    @property
    def config(self):
        return foo.PanelConfig(
            name="iaa_panel",
            label="IAA Panel",
            allow_multiple=False,
            surfaces="grid",
            help_markdown="A panel to filter IAA values in the views and show summary statistics.",
            icon="/assets/icon.svg",
            light_icon="/assets/icon-light.svg",
            dark_icon="/assets/icon-dark.svg",
        )