In vscode, an empty div tag is rendered

[KeJunMao]

Describe the bug

I'm using the extendMarkdownIt api to extend it, but it always generates one more empty div.

Reproduction

https://github.com/KeJunMao/vscode-markdown-alert

System Info

System:
    OS: Windows 11 10.0.22621
    CPU: (6) x64 Intel(R) Core(TM) i5-9500 CPU @ 3.00GHz
    Memory: 3.89 GB / 15.85 GB
  Binaries:
    Node: 16.20.2 - D:\WinGetApps\pnpm\globalBin\node.EXE
    npm: 9.8.1 - D:\WinGetApps\pnpm\globalBin\npm.CMD
    pnpm: 8.1.1 - D:\WinGetApps\pnpm\globalBin\pnpm.CMD
  Browsers:
    Edge: Chromium (119.0.2151.72)
    Internet Explorer: 11.0.22621.1

Used Package Manager

pnpm

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