There is no step "Select an OS" when creating an advanced web app with Node 20 LTS runtime

[v-xinda]

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OS: All App Service Build Version: 20231129.2 Azure Resources Build Version: 20231123.1 Regression: Not a regression

Repro Steps:

1. F1 -> Azure App Service: Create New Web App... (Advanced) -> Select a subscription -> Enter a name -> Select a resource -> Select "Node 20 LTS" runtime.
2. Check whether the next step is “Select an OS".

Expect: The next step is "Select an OS".

Actual: The next step is "Select a location for new resources".

More Info: This issue doesn't reproduce when creating the "Node 16 LTS" and "Node 18 LTS" web apps.