Shopify with Google Optimize and Safari

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Hi, I'm trying to get Google Optimize to work with Shopify. I've tried several setups- using the native Optimize tag in GTM, putting ga('require', 'GTM-xxxx'); in additional scripts under Preferences, put the anti flicker script in the head or in a GTM custom HTML tag.


I'm specifically testing redirects - landing on one product variant and redirecting to another page. This all seems to work fine on Chrome for the most part but it looks like it only works on Safari after i've hit the page and then do a refresh. The first time i hit the page it doesn't have the Optimize experiment in the URL, just the plain url. 


I'm thinking it's not loading Optimize fast enough so it's skipped. Is anyone else having this problem?