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onsave handler: preventDefault() does not cancel form save in Sales Hub

We have a form, for the appointment entity, for which we've registered an onsave-handling function. The intent is to display a confirmation dialog to the user when certain fields have been modified. To do this, the function cancels the initial save operation, then if the user clicks to confirm, it performs a second save operation asynchronously (with a check so that the function is not triggered again).

The code is roughly:

let confirmDialogIsOpen = false;

async function confirmSave(saveContext) {
    if (confirmDialogIsOpen) {
        // Allow save event from user confirmation
        return;
    }

    confirmDialogIsOpen = true;

    // Prevent save operation before async-break
    saveContext.getEventArgs().preventDefault();

    // ***Function synchronously returns here***

    // Get result for confirmation dialog
    const userHasConfirmed = await saveUserConfirmation();

    if (userHasConfirmed) {
        // Perform second save operation
        saveContext.getFormContext().data.entity.save();
    }

    confirmDialogIsOpen = false;
}

This works correctly in the old-style default hub, and in Customer Service Hub. However, in Sales Hub the `.preventDefault()` call seemingly has no effect. No exception is thrown, and when the function synchronously returns before the async break, the save is performed and the form is soft-reloaded.

Has anyone else experienced/worked around this? Is it a known issue?

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