Thanks for testing that! I am using the new Checkout Block, but I’m getting a different result when the cart total is $0.
https://drive.google.com/file/d/1N8sUp4Vt1mtCruN3i96SdswiBA65Zq59/view
Considering your test, perhaps this means I’m experiencing a plugin conflict? I can’t imagine that a setting would cause this.
Thank you for your help. Updating the plugins didn’t fix it. So, if I can get a staging site up I’ll probably try disabling and reenabling the plugins one by one to see if one of them is the culprit.