Build hangs with Microsoft.NET.Sdk.Functions version 4.1.3

#### Check for a solution in the Azure portal
For issues in production, please check for a solution to common issues in the Azure portal before opening a bug. In the Azure portal, navigate to your function app, select `Diagnose and solve problems` from the left, and view relevant dashboards before opening your issue.

#### Investigative information

Please provide the following:

- Timestamp: N/A
- Function App version: 4
- Function App name: N/A
- Function name(s) (as appropriate): N/A
- Invocation ID: N/A
- Region: N/A

#### Repro steps

Provide the steps required to reproduce the problem:

dotnet build

#### Expected behavior

Provide a description of the expected behavior.

Project compiles.

#### Actual behavior

Provide a description of the actual behavior observed.

`dotnet build` hangs at the target `_GenerateFunctionsExtensionsMetadataPostBuild`

#### Known workarounds

Provide a description of any known workarounds.

#### Related information

Provide any related information

* Programming language used
* [Links to source](https://github.com/michaelelleby/functionappbug)
* Bindings used

This is with .NET Framework 4.7.1 and upgrading to .NET 6 is not an option.

Log file from `dotnet build` [build.log](https://github.com/Azure/azure-functions-host/files/9776870/build.log)