Builder pages do not work with Safari 12

I noticed when testing one of my production Builder landing pages in Safari 12, the page will load for about a second and then go blank. I watched the network tab and it’s when the JS file is loaded: component—src-templates-page-jsx-bc7611c894a0f1542163.js

I’m using Gatsby + Netlify to deploy but the standard Gatsby index page loads just fine. It’s only the pages with Builder content.

Video of problem; https://assets.saucelabs.com/jobs/224e46dbb9d7443faac109ad91029cc3/video.mp4

Please advise