Using wp_editor in {$taxonomy}_edit_form_fields not working

[flyonthenet.com]

Consider this simple piece of code:

function test_form_fields( ) {
	echo '<tr class="form-field term-description-wrap"><th scope="row">Snippet</th><td>';
	wp_editor( 'TEST', 'snippet', array(
		'textarea_name' => 'snippet'
	));
	echo '</td></tr>';
}
add_action( 'category_add_form_fields', 'test_form_fields');
add_action( 'category_edit_form_fields', 'test_form_fields');

It's expected to show a functional TinyMCE editor, but something weird is rendered, seems mixed up with description field.

• Content not displayed (empty tinyMCE)
• No toolbar rendered
• No textarea tag with id "snippet" in source code
• Media / Visual / Text are applied to description field

[flyonthenet.com]

Replying to flyonthenet.com:

term-description-wrap class is causing the problem