Failed to transfer ** to strong label

[WangyfCO]

When I call the render function of HtmlRenderer.class in flexmark-java 0.64.6, two asterisks are ignored and two asterisks are rendered to wrong strong label. The green content failed to render, the yellow content render to wrong strong label.

What's wrong with the problem? I will appreciate it very much if someone help me to solve it. P.S. the problem