[BUG]: Task Group using IIS web app manage task

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[X] I searched for existing GitHub issues
[X] I read pipeline troubleshooting guide
[X] I checked how to collect logs

Task name

IIS web app manage

Task version

0.*

Issue Description

Trying to create a Task Group using the IIS web app manage task. I have the task configured type set to IIS Application Pool and filled in 2 fields with variables.

Saved the task group.

Then, I wanted to make $(AppCmds) optional. Using the Azure DevOps API (https://dev.azure.com/{our subscription}/{my project collectdion}/_apis/distributedtask/taskgroups/{task group id}?api-version=7.1-preview.1), I updated the $(AppCmd) input parameter with "visibleRule": "AppCmds != ''" like so:

    {
        "aliases": [],
        "options": {},
        "properties": {},
        "name": "AppCmds",
        "label": "AppCmds",
        "defaultValue": "$(AppCmds)",
        "required": true,
        "type": "multiLine",
        "helpMarkDown": "",
        **"visibleRule": "AppCmds != ''",**
        "groupName": ""
    },

Posted without issues.

When viewing the Task Group after hitting the refresh button, the IIS web app manage task resets:

Environment type (Please select at least one enviroment where you face this issue)

[X] Self-Hosted
[ ] Microsoft Hosted
[ ] VMSS Pool
[ ] Container

Azure DevOps Server type

dev.azure.com (formerly visualstudio.com)

Azure DevOps Server Version (if applicable)

N/A

Operation system

N/A

Relevant log output

There are no logs.

Full task logs with system.debug enabled

N/A

Repro steps

# Not using YAML, but here is what I'm setting.
steps:
- task: IISWebAppManagementOnMachineGroup@0
  displayName: 'Manage IISApplicationPool'
  inputs:
    IISDeploymentType: IISApplicationPool
    AppPoolName: '$(AppPoolName)'
    AppCmdCommands: '$(AppCmds)'

microsoft / azure-pipelines-tasks