Here is a proper screenshot. The bug occurs whenever the windows become large enough or numerous enough, at which point they overflow past the bottom screen in the Activities Overview. They are clipped to where if you highlight them, you cannot see their window titles. I tested not having the dock installed and this problem did not appear, so it seems to be a bug in the extension.
In fact, I just installed the dash-to-dock extension, and if you turn off the 'panel mode' so that the dock does not extend all the way down, the problem goes away.
Here is a proper screenshot. The bug occurs whenever the windows become large enough or numerous enough, at which point they overflow past the bottom screen in the Activities Overview. They are clipped to where if you highlight them, you cannot see their window titles. I tested not having the dock installed and this problem did not appear, so it seems to be a bug in the extension.
In fact, I just installed the dash-to-dock extension, and if you turn off the 'panel mode' so that the dock does not extend all the way down, the problem goes away.