Connection Annimations not working

[TheOddlySeagull]

This is what I was basing my variable off in the wiki: https://github.com/DonBruce64/MinecraftTransportSimulator/wiki/Pack-Making-JSON-Animation-Variables#connection

I have tried multiple itterations in my Trin Tormador tow truck animation. Unfortunately, it seems this variable system doesn't work. My tow truck has 2 connection types: HOOKUP and TRAILER. HOOKUP is index 0 and TRAILER is 1. The TRAILER connectiongroup has 2 connections: one for heavy duty (index 0), one for light vehicles (index 1). I first tried with: connection_1_connected, which should atart the animation when a vehicle is being towed by the tow truck, whether it's heavy duty or light vehicle. But nothing happens. I then tried with connection_0_connected, which in theory should animate when the tow truck is being towed by something, but that didn't work either. So, I tried connection_1_1_connected, which should of animated when the tow truck towed a light vehicle (only light vehicles, no heavy duty) but even that didn't work.

Here is my JSON related to connections and animations:

Animation:

{
    "objectName": "$tow_t",
    "animations": [
        {
            "animationType": "rotation",
            "variable": "connection_1_1_connected",
            "centerPoint": [
                0.0,
                0.5625,
                -4.0625
            ],
            "axis": [
                -90.0,
                0.0,
                0.0
            ],
            "duration": 160,
            "forwardsStartSound": "iv_tpp:hydraulic_sound",
            "reverseStartSound": "iv_tpp:hydraulic_sound"
        },
        {
            "animationType": "rotation",
            "variable": "damage_totaled",
            "centerPoint": [
                0.0,
                0.5625,
                -4.0625
            ],
            "axis": [
                -5.3167188487633465,
                0.8621032607957808,
                -2.899409689821537
            ]
        }
    ]
}

Connection:

"connectionGroups": [
    {
        "groupName": "HOOKUP",
        "isHookup": true,
        "connections": [
            {
                "type": "tow_bumper_heavy",
                "pos": [
                    0.0,
                    -0.3125,
                    8.1875
                ],
                "distance": 2.0
            },
            {
                "type": "tow_wheel_heavy",
                "pos": [
                    0.0,
                    -0.625,
                    7.0625
                ],
                "distance": 2.0
            }
        ]
    },
    {
        "groupName": "TRAILER",
        "canInitiateConnections": true,
        "isHitch": true,
        "connections": [
            {
                "type": "tow_bumper_heavy",
                "pos": [
                    0.0,
                    0.625,
                    -5.9375
                ],
                "distance": 3.0
            },
            {
                "type": "tow_bumper",
                "pos": [
                    0.0,
                    0.625,
                    -5.9375
                ],
                "distance": 2.0
            }
        ]
    }
],