in tab 2 of front window returns Terminal got an error: Can’t get tab 2 of window 1. (-1728) since High Sierra update

As the title says I have an Apple Script that does:

in tab 2 of front window

...which used to work fine but since the High Sierra upgrade returns:

Terminal got an error: Can’t get tab 2 of window 1. (-1728)

Which corresponds to errAENoSuchObject I can't find any documentation around this having changed - is this a bug? Is there a new or better way to do this?

The object hierarchy has changed slightly. Each tab is referenced in AppleScript as tab 1 belonging to a unique parent window object.

So, previously, if there were three tabs open in a single window, we could refer to them as tab 1, tab 2, and tab 3 of window 1. Now, we have tab 1 of window 1, tab 1 of window 2, and tab 1 of window 3.

I’ve found the most convenient and reliable way to target a specific tab is to identify the window object that contains the tab object with a specific tty property value. I use a command that looks something like this:

    tell application "Terminal"
        get the id of the first window ¬
            whose first tab's tty contains "003"

        set w to result
        close window id w
    end tell

If you want to get a slightly clearer picture of things, run this:

    tell application “Terminal” to ¬
        get every tab of every window

and this:

    tell application “Terminal” to ¬
        get properties of every window

and this:

    tell application “Terminal” to ¬
        get properties of tab 1 of every window