I've added a Custom Taxonomy (page=wpcf-ctt)
Now, when adding a new post for the Post Type,
Everything looks good, I have all the attributes available, can fill them, and pull them out in a template.
But when I assign that post to one of the items in the created Taxonomy, the Custom Attributes are gone in the Edit screen.
When removing the Taxonomy assignment, the attributes show up again and I can edit them.
Tested on both 0.9.2.1 and 0.9.3
Thanks for looking into this,