compare the typescript compile results
web/js/zk/ext/jquery.js vs web/js/zk/ext/jquery.src.js
web/js/zul/Widget.js vs web/js/zul/Widget.src.js
... several more
the minified production version contains additional (repeated) polyfill code
This extra code doesn't exist in the NON minified debug versions ... so it seems unnecessary, especially it's unexpected to add code during minification.
No additional repeated code in minified versions.
Only one definition of required polyfilled functions.
This additional code also conflicts with external JS libraries such as https://materializecss.com/ making an integration seem to work in debug mode but then fail during production (IE11 which actually runs the code)