git-annex add behaves differently from git on ACL

Please describe the problem.

I am yet to grasp what is "the best" or "legit" functioning here but I think it should be consistent between git add and git annex add, but we observe that on an ACL powered filesystem, git add commits without executable bit set, whenever git-annex add even if adding to git, results in executable bit set.

Gory details

(datalad) [f006rq8@discovery-01 ds-perms]$ cat .gitattributes 
* annex.backend=MD5E
**/.git* annex.largefiles=nothing
* annex.largefiles=((mimeencoding=binary)and(largerthan=0))

(datalad) [f006rq8@discovery-01 ds-perms]$ git --version
git version 2.39.2

(datalad) [f006rq8@discovery-01 ds-perms]$ git annex version --raw; echo
10.20240831+git21-gd717e9aca0-1~ndall+1

(datalad) [f006rq8@discovery-01 ds-perms]$ echo text > by-git-add
(datalad) [f006rq8@discovery-01 ds-perms]$ echo text > by-git-annex-add
(datalad) [f006rq8@discovery-01 ds-perms]$ git add by-git-add
(datalad) [f006rq8@discovery-01 ds-perms]$ git annex add by-git-annex-add
add by-git-annex-add (non-large file; adding content to git repository) ok
(recording state in git...)

(datalad) [f006rq8@discovery-01 ds-perms]$ git commit -m 'added two files, one with git-annex, one with git'
[master 1ed76d5] added two files, one with git-annex, one with git
 2 files changed, 2 insertions(+)
 create mode 100644 by-git-add
 create mode 100755 by-git-annex-add

So the git added one committed with mode 100644 whenever git-annex added -- with 100755.

Both files appear "identical" at POSIX or ACL level of permissions:

(datalad) [f006rq8@discovery-01 ds-perms]$ nfs4_getfacl by-git-add by-git-annex-add
# file: by-git-add
A::OWNER@:rwadxtTnNcy
A:g:rc-DBIC-admin@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy
A::d11124v@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy
A::f002d6b@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy
A::f00275v@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy
A::d31548v@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy
A::GROUP@:rwadxtTnNcy
A::d26427b@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy
A:g:rc-DartFSadmin@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy

# file: by-git-annex-add
A::OWNER@:rwadxtTnNcy
A:g:rc-DBIC-admin@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy
A::d11124v@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy
A::f002d6b@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy
A::f00275v@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy
A::d31548v@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy
A::GROUP@:rwadxtTnNcy
A::d26427b@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy
A:g:rc-DartFSadmin@KIEWIT.DARTMOUTH.EDU:rwadxtTnNcCoy

(datalad) [f006rq8@discovery-01 ds-perms]$ ls -l by-git-*
-rwxrwx---+ 1 f006rq8 rc-DBIC 5 Oct 16 15:05 by-git-add
-rwxrwx---+ 1 f006rq8 rc-DBIC 5 Oct 16 15:05 by-git-annex-add