I've been frustrated by Markdown previews not supporting Pandoc features, so I created a Pandoc-based Markdown preview for VS Code [1]. The preview supports all Pandoc extensions to Markdown syntax, because Pandoc itself generates the preview. There is also optional support for code execution with Jupyter kernels. I'm currently in the process of adding support for non-Markdown formats (including scroll sync), plus taking advantage of some of the new Pandoc 3.0 features.
[1]: Examples and animations: https://codebraid.org/presentations/scipy2022/. Installation for VS Code: https://marketplace.visualstudio.com/items?itemName=gpoore.c.... Installation for VSCodium: https://open-vsx.org/extension/gpoore/codebraid-preview.