I can copy+paste out of it, but the highlight background color is so close to the output background color that you can’t tell anything is highlighted, and the text color doesn’t change when highlighted either. I wouldn’t be surprised if OP didn’t notice that text was actually being highlighted. For instance, notice how difficult it is to notice the highlighted portion in this screenshot:
It used to be the selected text would turn white and the selection background color was blue. I’m not sure if the change is intentional or a bug, but IMO the blue background + white text is what it should be still. That blue selection + white text is pretty standard, and makes it clearly visible which text is selected.
Highlights are still difficult to see – would be great if the selection background color could be switched to blue and the selection text color switched to white.