Extension page doesn't show properly (overlapped by parent iframe container)

[narcotics726]

Azure DevOps Server 2019
17.143.28621.4 (AzureDevOps2019)
Windows Server 2016

I added a custom page in my extension

        {
            "id": "xxx-build-result-tab",
            "type": "ms.vss-build-web.build-results-tab",
            "description": "A tab contributing to build results view and depends on Cmdline task",
            "targets": [
                "ms.vss-build-web.build-results-view"
            ],
            "properties": {
                "name": "xxx",
                "uri": "buildReport.html"
				...
            }
        }

Sreenshot:

As you can see, the page size is fixed at a very small height because the parent iframe container.

How can I fix this? I tried install the Contributions Guide and found same result.

Is this a bug of AzureDevOps? Because I cannot re-produce it on SaaS verison(https://dev.azure.com).

Thanks.

[sathishkumarnarayanasamy]

are you setting height in properties? please see: this answer

"properties": {
"name": "Test results [preview]",
"uri": "static/test-results.html",
"height": 600
}