Comment # 10 on bug 1217414 from Boehmer

No.

In TW there is no /etc/login.defs:
    ll /etc/login.defs 
    ls: cannot access '/etc/login.defs': No such file or directory

The yast changes the file /etc/login.defs.d/70-yast.defs:
    --- /.snapshots/1353/snapshot/etc/login.defs.d/70-yast.defs 2024-06-21
18:40:27.621291748 +0200
    +++ /.snapshots/1354/snapshot/etc/login.defs.d/70-yast.defs 2024-07-19
18:24:07.444027813 +0200
    @@ -10,4 +10,4 @@
     SYS_UID_MIN 100
     SYS_GID_MAX 499
     SYS_GID_MIN 100
    -UMASK 022
    +UMASK 002

And this changes directly the umask for all new logins:
   su --login root
   Password: 
   pluto:~ # umask
   0002

    su --login alibaba 
    Password: 
    alibaba@pluto:~> umask
    0002

IMO the yast stores the 'Defaults for New Users' -> 'Umask for Home Directory'
in an inappropriate place and/or with an inappropriate name.