Token makes form editor crash
Hello friendly people,
I just wanted to create a form with a date selector and put a token here:

The token I have in my program is {{my.00_Webinar_Date}}. When I insert that, my editor crashes.

It's greyed out and nothing moves.

When I refresh my browser, my form looks like this:

As if the central frame didn't want to load anymore. There's nothing else I can except to delete that draft and start over.
Now here comes the _really_ wierd thing. It seems that this only occurs if my token starts with a numeral - like "0" in this case. I can save something like this:

That still makes my editor look very funky, but at least it's still functional:

Does anybody know what's going on here?