Cannot build template via .sln or .slnx

[ChrisTaylorDeveloper]

I create my Solution with dotnet new clean-arch -o CGT.Finance

When I run either dotnet build or dotnet build ./CGT.Finance.sln (or try from the Solution Explorer of VS Code) I get the following error:

CGT.Finance/CGT.Finance.sln(180): Solution file error MSB5023: Error parsing the nested project section in solution file. A project with the GUID "{08E69B3B-4418-40BD-80EC-B38C0ECFBAE2}" is listed as being nested under project "{106AE906-5075-410A-B941-912F811848EE}", but does not exist in the solution.
Build failed with 1 error(s) in 0.0s

When I try dotnet build ./CGT.Finance.slnx I get this error

CGT.Finance/CGT.Finance.slnx(1,1): error MSB4068: The element <Solution> is unrecognized, or not supported in this context.
Restore failed with 1 error(s) in 0.0s

Am I doing something wrong?

I am on Linux and using .NET 9. Thank you.

[ardalis]

Yeah I see the same thing. Let me troubleshoot real quick.

[ardalis]

Should be fixed in 10.1.1 available shortly. Also aspire is now included by default.

[ChrisTaylorDeveloper]

Thank you. Building with the .sln file seems fine. Building with either of the .slnx files still gives me the same <Solution> is unrecognised message.

[ardalis]

Hmm works for me on windows:

[ChrisTaylorDeveloper]

I have re-checked (Ubuntu 24.04.2) and the result is the same. I can build with the .sln but not with either .slnx.