Resolved
Resolved in: 1.9.6
A CRED form that contains Custom Field and Taxonomy with the same slug the result is that the Taxonomy is not showed on frontend.
This issue will be fixed in the next version of CRED.
In the meantime, this patch file can be applied by unzipping it and uploading the files it contains to replace the one with the same name. The files are:
field.php
in cred-frontend-editor/application/models/field/
cred.js
in cred-frontend-editor/library/toolset/cred/embedded/assets/js/