WordPress block editor embeds not working in theme (single.php)

That would be because they’re using oEmbed, not a shortcode.

You should use the function the_content() to render the content of a post, as it applies all the things required to make embeds, shortcodes, etc work properly. If for some reason that’s not an option, you can apply the content filter.

<?php echo apply_filters( 'the_content', $tpostObj->content ); ?>

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