A user is reporting that interactive rebase is not possible in 3.4.0.
There are two ways to start an interactive rebase in Sourcetree. The first is to right-click (or context-click) on a commit and choose Rebase children of <sha> interactively… The second is to pull down the Repository menu and select Interactive rebase.
The rebase executes.
The user has reported that there are no interactive rebase GUI capabilities available.
Currently, there is no known workaround for this behavior. A workaround will be added here when available