INCLUDECSS and INCLUDEJS Broken in 3.2

Using INCLUDECSS and INCLUDEJS no longer behave as they do in 3.1, and fail to find the designated files in the ACP of 3.2.x.

In an /adm/style/template file:
<!-- INCLUDECSS file.css --> or
<!-- INCLUDECSS @acme_demo/file.css -->
Neither work. Both try to locate files by using the full root path in the url.

So you get, which does not exist:

http://localhost:8888/Users/path/to/htdocs/phpBB/ext/acme/demo/adm/style/file.css

Instead of the expected:

http://localhost:8888/phpBB/ext/acme/demo/adm/style/file.css