Bug in pre_get_posts function

I found a bug in the plugin that causes sorting by products in a category not to work on the website.

In the file rearrange-woocommerce-products.php on line 393 is says:

if (is_tax('product_cat') && $query->is_main_query() && !is_admin()) {

But this is not working. I can fix this issue by replacing this line with:

if (is_tax('product_cat') && !is_admin()) {

Is this maybe something you can look into? Because I see a few topics that also mention this issue.