I've set my devices to be mounted automatically when attached. The problem is, that happens even before KDE Partition Manager finishes formatting them, which results in an error about the drive not being unmounted. 

Reproducible: Always

Steps to Reproduce:
1. Open the Removable Devices setting on KDE Neon 5.6.5
2. Set it to mount drives when attached
3. Open partitionmanager, unmount it, format it and create a new partition.

Actual Results:  
The drive should be mounted by the system automatically only after partitionmanager finishes the job completely.

Expected Results:  
The drive is mounted before partitionmanager display a success message. That causes it to tell the user to unmount the drive before editing the partitions.