6.6 beta-3:Freeform CSS Specificity when non-iframe editor

I tested WordPress 6.6 beta-3 with the default theme Twenty Twenty-One.
(I’m testing classic themes)

It’s about core/freeform CSS in the case of a non-iframe editor that added a meta box with PHP.
(I added a custom field with Advanced Custom Field)

I read an article about “WordPress 6.6 CSS Specificity“, but is the core/freeform style of the non-iframe editor not applicable?

For example:

.wp-block-freeform.block-library-rich-text__tinymce a {
    color: var(--wp-admin-theme-color);
}

Thanks

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– Theme: Twenty Twenty-One 2.2
– Plugins:
??* Advanced Custom Fields 6.3.1
??* WordPress Beta Tester 3.5.5
??* WP Multibyte Patch 2.9