There is an update for an application available. Because I'm not using the application anyway, I decided to uninstall it instead. I removed it using Discover, but it's still listed in the updates tab. Reproducible: Didn't try
Addendum: The update was installed even though I had removed the application before, so I had to uninstall it again afterwards.
Git commit 96b20849c754bf524946dd2c2b4405d762b446da by Aleix Pol. Committed on 11/05/2016 at 11:45. Pushed by apol into branch 'Plasma/5.6'. Fetch updates after un/installing packages M +19 -2 libdiscover/backends/PackageKitBackend/PKTransaction.cpp M +4 -0 libdiscover/backends/PackageKitBackend/PKTransaction.h M +1 -2 libdiscover/backends/PackageKitBackend/PackageKitBackend.cpp M +1 -1 libdiscover/backends/PackageKitBackend/PackageKitBackend.h http://commits.kde.org/discover/96b20849c754bf524946dd2c2b4405d762b446da