Reported in the WordPress.org support forums: The the_content filter cannot be removed by remove_filter( 'the_content', [ WP_Typography::get_instance(), 'process' ], 9999 );
The underlying issue is that due to changes to various type hints from the WP_Typography class to WP_Typography\Implementation, several instances of this supposed singleton are created.
Reported in the WordPress.org support forums: The
the_content
filter cannot be removed byremove_filter( 'the_content', [ WP_Typography::get_instance(), 'process' ], 9999 );