An error "ServiceUnavailable" shows under Functions node of one Linux .NET 6 Function App

[v-ruizh]

OS: Win10
Build Version: 20210825.5
.NET 6 Version: 6.0.100-preview.7.21379.14
Function Core Tools: v4

Repro Steps:

1. Create a Linux .NET 6 Function App.
2. Expand the Functions node of above Function App.
3. Check whether there is no error under Functions node.

Expect:
There is no error under Functions node.

Actual:
An error "ServiceUnavailable" shows under Functions node.

More Info:

1. This issue does not reproduce for a Windows .NET 6 Function App.
2. Refreshing can't fix this issue.
3. Fail to deploy .NET 6 C# project to the Linux .NET 6 Function App with the same error.
   

[ejizba]

For now this is expected, but I will leave this issue open for tracking purposes

At this time, you can only deploy .NET 6.0 function apps to Azure Functions V4 preview on Windows hosting plans.

https://techcommunity.microsoft.com/t5/apps-on-azure/what-s-new-with-net-on-azure-functions-june-2021/ba-p/2428669