Pull with 'pull.rebase=preserve' does rebase on invalid upstream

What steps will reproduce the problem?

1. On attached repository in directory Work start Pull and select origin2

What is the expected output? What do you see instead?

Rebase is done on remote origin, but should be on origin2.

What version of TortoiseGit and Git are you using? On what operating system?

GIT master

Please provide any additional information below. Bug.zip