Quote Originally Posted by susedio View Post
I looked into openSUSE:Backports:SLE-15-SP1 and the package are also missing from there.

When branching them from Leap and (in the case of plasma5-SLE) openSUSE:Backports:SLE-15 they work fine, so it seems like they were removed from the repo by mistake.
I've pinged one of my SUSE Package Hub contacts, lets see if can get it resolved for you