Workflow container remains active after server workflow is finished in Mobile

In Mobile, I have a workflow that in turn runs a server workflow. This works fine, i.e. the last activity is a Send E-mail activity, and the mail is actually sent.

However, the workflow container remains active, it show the workflow title, and the 'progress indicator moving dots'.

I tried adding an Exit Workflow after Send E-mail, but that makes no difference. Nor does removing the Send E-mail activity.

The log window has just one RunWorkflow entry, while for all other activities there are two.

Is there something special I need to do to run a server workflow from Mobile?