taxonomy.php post display bug?

hi
I seem to have encountered a bug with how taxonomy.php displays content:

1. I have a custom taxonomy that extends to multiple custom post types as well as the regular post type. Upon calling the taxonomy.php it shows only regular posts and no custom posts that have a matching taxonomy term.

2. if i remove the regular post from the register_taxonomy and thus extend it to custom post types only, taxonomy.php will display all related custom posts without a problem.

Took me a while to find the problem and it seems to be a bug, no? somehow extending your custom taxonomy to both custom post types and regular posts and pages will make the taxonomy.php ignore the custom post types completely.

not sure how to fix this other than foregoing on regular posts/pages and making all post types custom

Maarten