dotnet pack not working when project file passed

I have the following issue:

I am running dotnet pack --no-build -c Release .\Client.csproj and am getting error NU5026: The file 'Client\bin\ Release\net7.0\Client.dll' to be packed was not found on disk

However, when I don't pass a csproj, it works:

Successfully created package 'Client\bin\x64\Release\Client.1.0.0.nupkg'

It seems the packing command is struggling to identify the output path (x64 is missing).

The csproj file:

<Project Sdk="Microsoft.NET.Sdk.Web"><PropertyGroup><TargetFramework>net7.0</TargetFramework><ImplicitUsings>enable</ImplicitUsings><Nullable>enable</Nullable><OutputType>Library</OutputType><IsPackable>true</IsPackable><Platforms>AnyCPU;x64</Platforms><PlatformTarget>x64</PlatformTarget><StaticWebAssetsEnabled>false</StaticWebAssetsEnabled><!-- tried this trick, didn't work--><!--Platform Condition=" '$(Platform)' == ''">x64</Platform--></PropertyGroup></Project>

and an excerpt of the sln file:

Global    GlobalSection(SolutionConfigurationPlatforms) = preSolution        Debug|x64 = Debug|x64        Release|x64 = Release|x64    EndGlobalSection    GlobalSection(ProjectConfigurationPlatforms) = postSolution        {ED0EAE71-53F9-4C7B-BD5A-02B960CAFD5E}.Debug|x64.ActiveCfg = Debug|x64        {ED0EAE71-53F9-4C7B-BD5A-02B960CAFD5E}.Debug|x64.Build.0 = Debug|x64        {ED0EAE71-53F9-4C7B-BD5A-02B960CAFD5E}.Release|x64.ActiveCfg = Release|x64        {ED0EAE71-53F9-4C7B-BD5A-02B960CAFD5E}.Release|x64.Build.0 = Release|x64        {A4B1F3EA-12B9-4F54-B1C2-CE0401DC0335}.Debug|x64.ActiveCfg = Debug|x64        {A4B1F3EA-12B9-4F54-B1C2-CE0401DC0335}.Debug|x64.Build.0 = Debug|x64        {A4B1F3EA-12B9-4F54-B1C2-CE0401DC0335}.Release|x64.ActiveCfg = Release|x64    EndGlobalSection    GlobalSection(SolutionProperties) = preSolution        HideSolutionNode = FALSE    EndGlobalSection    GlobalSection(ExtensibilityGlobals) = postSolution        SolutionGuid = {1251856A-31D8-4464-A039-62134CBC30FF}    EndGlobalSectionEndGlobal

I know the following solutions would work, but can't rely on them:

• building during packing (removing --no-build), because we do build in 2 steps so that we don't pack systematically (in local for example), and so we can version packed artifacts in AzureDevOps
• packing during building (with <GeneratePackageOnBuild>true</GeneratePackageOnBuild>), same reason
• not specifying a csproj in the packing command: as we don't want to pack every project, but just a subset of them
• use Debug configuration, I can't as the Release configuration is the one excluding unit tests and the likes