[BUG]PLAY and PAUSE commands not working
**Describe the bug**
Not 100% sure if it's a bug but I have overriding PLAY/PAUSE commands in a few of activities, today I found them not working anymore. There was no recent change to configuration file, and I use function not very often so not sure if it was brought by one of recent update, it used to work without issue.

**To Reproduce**
Define configuration to override PLAY and PAUSE commands, use the remote in iOS press the Play/Pause button nothing happens. I also experienced this issue with my other activities.
            
**Expected behavior**
When press Play/Pause button, the defined command is triggered

**Screenshots**
If applicable, add screenshots to help explain your problem.

**IOS (please complete the following information):**
- Version 14.5
- Device: iPhone 11 Pro Max

**Logs**
**When play/pause is pressed**
5/8/2021, 10:45:06 AM] [Logitech Harmony] (Logitech Harmony)INFO - SET Characteristic.RemoteKey : 11 with currentActivity 45280979
[5/8/2021, 10:45:06 AM] [Logitech Harmony] (Logitech Harmony)INFO - current play status is : undefined with playPause option set to :true
[5/8/2021, 10:45:06 AM] [Logitech Harmony] (Logitech Harmony)INFO - pauseCommand defined for  : 45280979 is undefined
[5/8/2021, 10:45:06 AM] [Logitech Harmony] (Logitech Harmony)INFO - sending PlayCommand for PLAY_PAUSE
[5/8/2021, 10:45:06 AM] [homebridge-harmony] This plugin threw an error from the characteristic 'Remote Key': Unhandled error thrown inside write handler for characteristic: incommingCommandToSend.split is not a function. See https://git.io/JtMGR for more info.
[5/8/2021, 10:45:06 AM] [homebridge-harmony] TypeError: incommingCommandToSend.split is not a function
    at HarmonyBase.sendCommand (/homebridge/node_modules/homebridge-harmony/harmonyBase.js:1767:53)
    at HarmonySubPlatform.handlePlayPause (/homebridge/node_modules/homebridge-harmony/harmonySubPlatform.js:685:24)
    at HarmonySubPlatform.<anonymous> (/homebridge/node_modules/homebridge-harmony/harmonySubPlatform.js:858:18)
    at RemoteKey.emit (events.js:315:20)
    at /usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1632:16
    at new Promise (<anonymous>)
    at RemoteKey.<anonymous> (/usr/local/lib/node_modules/homebridge/node_modules/hap-nodejs/src/lib/Characteristic.ts:1630:14)
    at step (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:143:27)
    at Object.next (/usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:124:57)
    at /usr/local/lib/node_modules/homebridge/node_modules/tslib/tslib.js:117:75
[5/8/2021, 10:45:06 AM] [Logitech Harmony] (Logitech Harmony)INFO - SET Characteristic.Active 1
[5/8/2021, 10:45:06 AM] [Logitech Harmony] (Logitech Harmony)INFO - value of Characteristic.ActiveIdentifier 45280979
[5/8/2021, 10:45:07 AM] [Logitech Harmony] (Logitech Harmony)INFO - not launching, there is a current Activity defined -45280979

I think the plugin found the override configured when the bridge starts:
.[37m[5/8/2021, 10:45:01 AM] .[39m.[36m[Logitech Harmony].[39m .[90m(Logitech Harmony)INFO - commands found fo
r ovverride : Internet Radio-PLAY:{"command":"Mute","type":"IRCommand","deviceId":"49730126"}.[39m

**When other override is used:**
[5/8/2021, 10:52:12 AM] [Logitech Harmony] (Logitech Harmony)INFO - SET Characteristic.RemoteKey : 6 with currentActivity 45280979
[5/8/2021, 10:52:12 AM] [Logitech Harmony] (Logitech Harmony)INFO - sending command {"command":"PresetPrev","type":"IRCommand","deviceId":"49730126"}for 6
[5/8/2021, 10:52:12 AM] [Logitech Harmony] (Logitech Harmony)INFO - sendingCommand{"command":"PresetPrev","type":"IRCommand","deviceId":"49730126"} 1 times
[5/8/2021, 10:52:12 AM] [Logitech Harmony] (Logitech Harmony)INFO - sendCommand done{"cmd":"vnd.logitech.harmony/vnd.logitech.harmony.engine?holdAction","code":200,"id":"0.7355585364898574","msg":"OK"}



**Config**
Below is the config for the activity in question:
   {
                    "ActivityName": "Internet Radio",
                    "CommandsList": [
                        {
                            "CommandName": "ARROW_RIGHT",
                            "NewCommand": "AV Receiver;NextPreset"
                        },
                        {
                            "CommandName": "ARROW_LEFT",
                            "NewCommand": "AV Receiver;PrevPreset"
                        },
                        {
                            "CommandName": "ARROW_UP",
                            "NewCommand": "AV Receiver;Net/UsbUp"
                        },
                        {
                            "CommandName": "ARROW_DOWN",
                            "NewCommand": "AV Receiver;Net/UsbDown"
                        },
                        {
                            "CommandName": "SELECT",
                            "NewCommand": "AV Receiver;Net/UsbSelect"
                        },
                        {
                            "CommandName": "BACK",
                            "NewCommand": "AV Receiver;Net/UsbReturn"
                        },
                        {
                            "CommandName": "PLAY",
                            "NewCommand": "AV Receiver;Mute"
                        },
                        {
                            "CommandName": "PAUSE",
                            "NewCommand": "AV Receiver;Mute"
                        }
                    ]
                }

The option  "playPauseBehavior" is set to true.

**Additional context**
N/A

Edit: added with debug logs