Creating a new branch using SVN makes impossible to make diff between old revisions

Creating a new branch in a SVN repository makes impossible to diff 2 revisions of a file commited in a different branch than the new one.

For example, after creating and checking out a branch named "trunk_copy", the revisions for a file that were made in the branch "trunk" can't be differed. FishEye shows the message "Could not resolve revisions xx and xx".

I attached a video reproducing the issue, as a log.