Its the production optimizer causing the issues.
https://stackoverflow.com/questions/51123831/ng-build-prod-cannot-set-property-autoactivated-of-undefined
Two ways to fix this:
In your angular.json file add the uncompressed versions of the files needed. Let the compiler compress the files.
"scripts": [
"node_modules/gsap/src/uncompressed/TimelineLite.js",
"node_modules/gsap/src/uncompressed/plugins/CSSPlugin.js",
"node_modules/gsap/src/uncompressed/plugins/AttrPlugin.js"
],
Second, but not recommended, is to set "buildOptimizer" to false.
