Ah, an interesting edge case! This occurs when you have already solved the puzzle with the account you’re logged in with (so we load your previous solution from your account) and the puzzle is relatively long. This should be relatively rare so unless this is a significant issue I probably wont work on this in the short term.
If there happens to be anyone interested, I have described a short-term fix on GitHub which could be a good first contribution
Were you able to open the puzzle? I hope I don’t need that program yet, just built my new pc less than a week ago. That’s why I was redoing the speed tests.