Hi everyone ! (Thanks gideon ^_^)
I checked also by Demo Site.
Error source: qa-content/qa-page.js (L39)
I corrected to the lower code.
function qa_set_inner_html(elem, type, html)
/* replace CMSBOX [start] */
/* elem.innerHTML=html; */
/* replace CMSBOX [end] */
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July 15, 2020: Q2A 1.8.5 released!