Possible bug in using auth plugin

I think I may have found a bug. I haven't fully dug in so it's possible I've just done something wrong...but let me try to explain it.

I'm using Runway 3.0.8.

In the PerchUsers class, on line 24 it tries to include the auth plugin class. From what I can tell, it ends up with a path like:

perch/addons/plugins/auth/perch3_/auth.php

Whereas in other locations, such as perch/core/inc/auth.php, it uses the following:

perch/addons/plugins/auth/abc/auth.php

Where abc is the name of the auth plugin.

The latter is correct and works.

The first is using the DB prefix whereas the second is using the auth plugin constant.

Does that make sense?