Your remote is working but just not how you want it. Someone posted about this exact same thing a couple days ago. I assume your remote has a function to shift between acting as a mouse and a remote. Once they did this then their remote worked as they wanted. If it needs to be adjusted further then you can download the keymap editor to edit the keys. If you don’t have an option to switch to remote mode and want to disable the mouse behavior then you can disable the scrolling by making a custom keymap and adding a few arguments. Read through this thread…
Just as a FYI this had nothing to do with the update (there was not changed behavior in this system). I’m not sure why went the clean install instead of just actually updating your existing install. That kind of seems like a lot of extra effort.