NFSv4 / POSIX ACL mapping bug?

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Hi,

I need some help clarifying this issue in order to know if this is a bug 
or limits of the NFSv4 / POSIX ACL mapping before reporting it

Creating a directory on the server with the following POSIX ACLs, rwx 
for the group "sharedgroup" and same defaults:

############################################################
# file: directory
# owner: root
# group: root
user::rwx
group::r-x
group:sharedgroup:rwx
mask::rwx
other::---
default:user::rwx
default:group::r-x
default:group:sharedgroup:rwx
default:mask::rwx
default:other::---
############################################################

Creating files with the same user with umask 022 on the server an on the 
NFS client, the files do not get the same POSIX ACL mask:

############################################################
# file: client
# owner: test
# group: testgroup
user::rw-
group::r-x                   #effective:r--
group:sharedgroup:rwx        #effective:r--
mask::r--
other::r--

# file: server
# owner: test
# group: testgroup
user::rw-
group::r-x                   #effective:r--
group:sharedgroup:rwx        #effective:rw-
mask::rw-
other::r--
############################################################

Is this normal or a bug?, My interpretation is that even that the 
mapping of the ACLs is not 100% perfect this simple example should not 
be a problem. Is it impossible using NFS to create a shared directory 
for a group of users?
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