OK - just seems to go to automatic unfurl without a mini-preview, like it did before. But at least it doesn't just get stuck there trying to pull up a preview and then just stopping.
Well, I guess a laptop also. I had not tried a laptop, but laptops usually do the same as PC's. My PC has the smilie button, my phone has the 3 dots. So maybe only a PC has the button visible without the dots.
Probably resolution or zoom related. I have my browser at 150% so I can read it and I have the 3 dots to select first. At home, I don't have that and have the smiley button visible because it fits in the bar showing all the icon buttons.