I tested this in Laravel version 12 and the problem was fixed.
Just be careful to remove the indentation.
<x-mail::message>
this is title
<x-mail::panel>
this is panel
</x-mail::panel>
<x-mail::button :url="'https://laravel.com/docs/12.x/mail#markdown-mailables'" color="error">
this is button
</x-mail::button>
</x-mail::message>
and: