[BUG] Katex syntax not rendered when inside an HTML element

• [ x] I have searched for existing issues that already reported this problem and found none
• [ x] The bug is present in REPL

Describe the bug

To Reproduce

# <span>$x+2$</span>

https://markmap.js.org/repl#?d=gist%3A74942d615cedceb87ac3885579069dfe%3A6f437c91f75f59c5423be4c914c1ed72df3b0d8b%2Ftest.md

Expected behavior

Actual behavior

Environment:

• OS: Ubuntu
• Browser: Brave
• Browser Version: 1.86.142

Additional context

Thanks again for your wonderful application!