Everyone knows about thumbnails not updating. But it's even worse when you feature a project on your profile.
Even after swapping it out and then putting it back in, the featured project's thumbnail will always be set to the one I had when I first featured it.
And yes, I've tried hard refreshing, restarting Chrome, AND restarting ChromeOS. Yet it doesn't update.

My browser / operating system: ChromeOS 13597.84.0, Chrome 88.0.4324.153

Yes that can happen. What I would do is make a copy of that project

say [Heya! Some of my favorite things are:] for (2) secs
switch costume to [sloths! (of course) v]
play sound [80s music v]
change pen color by (the color blue)