Safari 13 Beta on Mac OS hanging when I click on a dropdown

Our software partner found the problem. It occurs when the styling contains: text-rendering: optimizeLegibility;

A solution for us is to (globally) override the styling of the select:

<style>
   select * {
       text-rendering: unset !important;
   }
</style>

I'm seeing success with

<style>
  select {
    text-rendering: auto !important;
  }
</style>

after seeing this comment .