Hello,
The plugin add its own code – https://prnt.sc/1xdxl8d , but we do not have such action when Single Product Builder is activated, so we added custom code via snippet plugin, that shows the desired content on the single product page via another action https://prnt.sc/1xdxsic http://prntscr.com/1xdxzbi
Clear cache and check now.
Regards