Problem converting code back to blocks

I converted some MakeCode blocks to Python, made a few minor changes, then tried reverting back to the blocks. A dialog box appeared explaining that I would lose my changes, which was fine. However, when I clicked "Discard and go to Blocks," the dialog box did not respond. The only way I could get it to close was by clicking "Stay in Python."

Now it seems that I'm stuck using Python. Any idea what's going on here? Is there anyway to force a conversion back to the Blocks GUI?