Migration of KRunner shortcut doesn't work (or launcher starts in background)

*Summary:*

Since the upgrade to 20.04 (coming from Kubuntu 19.10), the Alt+F2 (or my personal alternative Alt+D) that are bound to launching KRunner seem to open KRunner in the background. Previously I could press Alt+D (or Alt+F2) and start typing, hit enter and start a new program. Now, I can only do this when I'm looking at an empty workspace. If I have any application open in the current workspace, the shortcut seems to be ignored and the program name is typed into the open application.

*Solution or workaround*
It seems that in the Global Shortcuts I need to assign the shortcuts to Application Launcher -> KRunner rather than Other Shortcuts -> Run Command. When I manually set the shortcuts there, KRunner launches in the foreground again. If this is the expected migration path, it should be automated after the version upgrade.

*Require information*

1) Ubuntu version:
Description: Ubuntu 20.04 LTS
Release: 20.04

2) Version: plasma-workspace Installed: 4:5.18.5-0ubuntu0.1

3) What I expected to happen: I expect Alt+F2 or Alt+D (or other configured shortcuts) to start KRunner in the foreground and accept subsequent keypresses. If the target for shortcuts is changed between Plasma versions, I expect this migration to be automated after upgrading.

4) What happend instead: Alt+F2 / Alt+D doesn't show KRunner and only accepts input when there are no other windows on screen. Migration has to be done manually after discovering the difference.