file copy override at sticky-bit directory failed with permission denied

[and]

file copy overwrite at sticky-bit directory (usual /tmp) failed with permission denied even as root user.

Steps to reproduce:

1. create testcase

   root# mkdir /test/
   root# chmod 1777 /test/
   root# touch /test/t1
   root# touch /test/t2
   root# chown nobody:nobody /test/t1
   

2. start mc as root -> copy t1 to t2 -> Overwrite this file? -> yes

Actual result:
mc response with "Cannot create target file /test/t2" -> Permission denied (13)

tested and failed also with older e.g. mc-4.8.22

Expected result:
Should work like successful cp

root# cp -p /test/t1 /test/t2