man with no bash

i just took solaris 11.3 beta for a ride and noticed that one annoying issue i had with the previous versions is still not fixed. it might not be an issue at all but i haven't found a solution yet. it's something rather trivial:

when using the other shells (i usually have tcsh as login shell) instead of bash man doesn't work. setting MANPATH doesn't help either. only using man with -M works. so far i used an alias as a workaround but would like to know if there's an "official" reason for this behavior.