Redirecting issue for wp-includes/css/dist/block-library/style.min-rtl.css

[msn6060]

After updating WordPress to 5 version, this link:
yoursite.com/wp-includes/css/dist/block-library/style.min-rtl.css
is redirect to
yoursite.com/wp-includes/css/dist/block-library/style.min-rtl.css/

It means that instead of loading css file, browser request to get this directory but it is not exist in WordPress core.
I think it's related to gutenberg blocks because before installing it, this file didn't exit in core of WordPress.

So this issue causes to have several seconds delay in loading site (so loading of site needs to more times due to this issue). I also test it locally and the result is the same.

[RMarks]

Duplicate of #45646.