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The chmod() at 2.7074 is probably the culprit.

You can start up this dtrace script as root, then use vim to cause ACLs to disappear:

#!/usr/sbin/dtrace -s

#pragma D option flowindent
...

Could you post the output from truss, while you use vim to edit and save a file in a way that destroys the NFSv4 ACLs?truss -f -a -vall -l -d -o /truss/output/file vim /file/with/nfsv4/acls

What OS are you running VIM on?

I'm not sure I understand your explanation of what you've done. Did you try with the LD_PRELOAD set, and found that the ACLs were preserved?

Do you have a complete truss output with "nobackup"...

The bug appears to be at line 4763 of fileio.c in the vim source code from Vim source archives : vim online (http://www.vim.org/sources.php) :

#ifdef UNIX
if (made_writable)
perm &=...

I think your /etc/sudoers should work.
Check that your sudo command really opens /etc/sudoers:
truss -f -t open sudo -l(need to run this as root)

AFAIK the roles belong to RBAC, and sudo works without RBAC.
That means sudo should work even without the root role.
--
BTW positive logic is shorter:
grep '^[^#]' /etc/sudoers