Description:
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I have tried a few times to add a new user contributed note. If I select Preview or Add Note, I am returned to add-note page, without the form part.

The note itself doesn’t appear to be added.

Currently using Firefox on MacOS. I can’t see that that makes any difference.

Test script:
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For PHP 7.1 on, the documentation states that integer and string keys can be mixed, but that elements with and without keys cannot. Here is an example, using data from getimagesize() with mixed keys:

<?php
	$data=[
		0=> 160,
		1 => 120,
		2 => 2,
		3 => 'width="160" height="120"',
		'mime' => 'image/jpeg'
	];
	list(0=>$width,1=>$height,2=>$type,3=>$dimensions,'mime'=>$mime)=$data;
?>

Here, the numeric keys also need to be specified, as if the whole array is treated as an associative array.

As noted elsewhere, the list() operator can be written in array format:

<?php
	[0=>$width,1=>$height,2=>$type,3=>$dimensions,'mime'=>$mime]=$data;
?>