Markdown syntax of emphasize highlighting mismatch with preview

`this*is.*a**simple.**case`

on GitHub: this*is.*a**simple.**case, the same as vscode preview

on editor view: this<em>&ast;is.&ast;</em>a<strong>&ast;&ast;simple.&ast;&ast;</strong>case

using vscode 1.97.2 on win64 (Windows 11 24H2 26100.2314)