magento2: [2.1.0] HTML minification problem with php tag with a comment and no space at the end

Steps to reproduce

1. Install Magento 2.1.0 using composer
2. Create a theme and a template file which contains this:

<?php //if ($showDescription):?>
    <div class="product description product-item-description">
        <?php /* @escapeNotVerified */ echo $_helper->productAttribute($_product, $_product->getShortDescription(), 'short_description') ?>
    </div>
<?php //endif; ?>

1. Turn on html minification in the backend

Expected result

1. Page is rendered properly without errors

Actual result

1. Error message appears: Parse error: syntax error, unexpected '<'.

The minified php/html file was turned into:

<?php <div class="product description product-item-description"><?php /* @escapeNotVerified */ echo $_helper->productAttribute($_product, $_product->getShortDescription(), 'short_description') ?></div><?php ?>

Temporary solution

Add a space at the end and it works again, like this:

<?php //if ($showDescription): ?>