Hi! We just fixed this issue.
There are two ways to create a workspace:
From the workspaces view, clicking on "Create new workspace..."
From the repositories view, right-clicking on a repository, and selecting "Create workspace for this repository..."
For the second option, the dynamic workspace checkbox was being ignored. I assume this is the method you were using
We fixed it, and it will be available on the next release. Until then, you can use the first method to create a dynamic workspace
Thanks for the report