PackageOutputPath not working?

[mfm-gwt]

Am I doing something wrong? I'm trying to build a nuget package that previously worked fine but now it keeps trying to build in either C:\Program Files\Microsoft Visual Studio\2022\Professional\Common7\IDE\ or C:\Windows\System32\ depending on if I'm running as administrator. I'm using Visual Studio 2022 and have <PackageOutputPath>..\nuget\ </PackageOutputPath> in my csproj file. If I try to edit that in VS project properties Package Output Path it always resets to $(MSBuildStartupDirectory)\nuget\ and can't be changed. I switched to NET6 & NET8 targeting recently but changing it back to NET7 doesn't help. Other projects are configured exactly the same way in the same parent solution and work as I expect.