@jamesmosier After some testing, it appears that issue is not our Tag Manager, it is just our Tag Manager exposes the issue. The Tag Manager runs sync in the Head and adds script (configured into the tool) to the Head, when it does this, it causes the React/Head to regenerate meta tags.

We replicated it by removing the Tag Manager and adding a local script to the Head that basically does this:

var a = document.createElement('meta');
a.setAttribute('name', 'jay');
a.setAttribute('content', 'jay');
console.log(document.head);
console.log("this script is firing");
document.head.append(a);

var a = document.createElement('meta');
a.setAttribute('name', 'jay');
a.setAttribute('content', 'jay');
console.log(document.head);
console.log("this script is firing");
document.head.append(a);

var a = document.createElement('meta');
a.setAttribute('name', 'jay');
a.setAttribute('content', 'jay');
console.log(document.head);
console.log("this script is firing");
document.head.append(a);

Each time we add an element to the Head, another meta tag is duplicated into the HTML. The more document.head.append actions, the more meta-tags are being duplicated.