Is this the same as T5580?

How did you get the content of the revision to your local machine?

I did like this

$ git checkout master
$ arc patch DXX

Then, I checked if 'arcpatchDXX' branch was created.

$ git branch 
* archpatchDXXX
$ arc land

The result of 'arc land' is what I mentioned the details above.

To send a specific commit from patch into master, should I use just 'git push'?

arc patch and arc land should combine to work like in T5580: The author information is retained from the Revision, and the commiter information is the user running arc land.

Testing this locally, it appears that arc land breaks this somehow.

The more I look at this, the more it looks like it was always doing this...

The code basically runs merge --no-stat --squash --ff-only branch (Which doesn't commit) and git commit (Which uses the user's information).

Re-reading T4333, it looks like that's always been the case, and we haven't fixed it yet.