How do I use a token to set the default value of a date field to the current date? When I go to the build tab of the webform and click edit on the date element, I can find the default value setting under the advanced tab in the element editor. The help text says I can use tokens, but I'm having trouble making a token work there. (I'm trying to use the [current-date:html_date] token).

If I click "set default value", another dialog opens with a text input and a button that says "update default value". But when I click that button after putting the token into the input, it goes back to the advanced tab and the default value input is empty. If I enter the token before clicking "set default value", the "update default value" dialog opens with an empty input. I've tried various combinations/orders and can't get the token to stay there. It doesn't matter if I type it in, copy/paste it, or fill it using the "browse available tokens" tool.
Leave the "set default value" button alone. Something about it makes it seem like a really good button to click for setting a default value, but you don't need it. Just enter the token in the default value input on the advanced tab and click save.

This seems simple enough in hindsight, and I'm not sure why it took so long for it to occur to me to try it. Hopefully if someone else has the same problem, this answer can help save them a few minutes, or perhaps even a longer period of time we won't mention here.