This has been happen almost few months ago and still not fixed until now. Back in the early 2021 and before 2021 this just works fine.
There is a bug related about it that is mentioned in github.
Here are the some screenshot related with the missing icons and Safari settings that i used.
the browser setting
even im disabling the cross-site tracking, the icon still missing. im also using Adguard and disabling it still doesnt making the icon appear.
Can this be fixed in the next version or is there any workaround to this?