When I add the script it doesn't automatically add STM pagination. If I add it manually or click Manual Set Up it adds one that is disabled and throws null errors because overflow text isn't assigned. Clicking Manual Set Up again sometimes assigns the overflow text, sometimes not. At that point, it creates a second STM clone with an exact copy of the first one's text. After this happens, the original's text is stale and doesn't update when I change the text in the text box.
I copied your settings and wasn't able to get it to automatically create/destroy/assign text to STM objects.