Command not found in VSCode extension

I am trying to create a VSCode extension. This extension provides two commands, never mind their implementation:

export function activate(context: ExtensionContext) {

    const provider = new ContentProvider();
    const providerRegistrations = Disposable.from(
        workspace.registerTextDocumentContentProvider(ContentProvider.scheme, provider)
    );

    // Open the dynamic document, and shows it in the next editor
    const openMyExtensionCommandRegistration = commands.registerTextEditorCommand('extension.openMyExtension', editor => {
        // Activate the extension and do something
    });

    const useMyExtensionCommandRegistration = commands.registerTextEditorCommand('extension.useMyExtension', editor => {
        // Do something
    });

    context.subscriptions.push(
        provider,
        openMyExtensionCommandRegistration,
        useMyExtensionCommandRegistration,
        providerRegistrations
    );
}

And this is a part of my package.json file:

"activationEvents": [
        "onCommand:extension.openMyExtension"
    ],
    "main": "./out/extension",
    "contributes": {
        "commands": [
            {
                "command": "extension.openMyExtension",
                "title": "Open my extension",
                "category": "MyExtension"
            },
            {
                "command": "extension.useMyExtension",
                "title": "Do something with my extension",
                "category": "MyExtension"
            }
        ],

The first command, which is supposed to activates my extension, works. It appears in the command palette, and actually does what it is supposed to do when invoked.

The second command however, despite appearing in the command palette, raise the following error message when called:

command 'extension.useMyExtension' not found

I find it weird that my first command works fine but not the second since the code is quite similar. Any ideas why?

Note that I obviously changed some variable names, I double checked for typos in the real code.

Since my comment helped someone, I would like to post it as an answer to give it more visibility:

I was able to fix this issue by manually compiling the Typescript source (by running tsc -p ./ into my root folder). This command should be ran automatically when debugging, however, I was still not able to find why it was not the case on my machine.