Reopened files from a previous session have to be manually activated once, before appearing in the list.
Non file buffers are filtered out by looking for a ".", so files that don't have a "." in their name won't show up in the list. Logically, non file buffers like "Settings" won't show up either. Same goes for files that end with ".git".
Code might be subpar, I don't know anything about vscode extensions, so I let ChatGPT write it.