GP 3.2 update breaks my animation..

Sure...

I installed Twenty Twenty One theme in the staging site, can you activate that to test?

Yep.... but I have scripts being added via Elements so will need to install a header script plugin

Oh yeah, sorry, forgot about the scripts. Yes, can you try that? Let us know how it goes.

hmmm. Off the bat it looks like TwentyTwenty is not working either.

I see. In your live site, you're using a Child theme. Is there anything there you've added necessary for the Animation to work?

As it's not working in a default WordPress theme, the issue might not entirely be related entirely to the update of GeneratePress. Does the Animation work on GP 3.1.3 with the Parent Theme activated?

Whew.... I got it. It needs onload="init();" in the body tag.

Now added to header.php in the child theme. Thanks for your help.

I see. Glad it's resolved now! You're welcome!