dotnet test doesn't work with our solution

```console
$ dotnet test
PascalABC.NET.SDK -> W:\Projects\PascalABC.NET.SDK\PascalABC.NET.SDK\bin\Debug\net6.0\PascalABC.NET.SDK.dll
Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
Testhost process exited with error: Error:
An assembly specified in the application dependencies manifest (PascalABC.NET.SDK.TestFramework.deps.json) was not found:
package: 'MedallionShell', version: '1.6.2'
path: 'lib/netstandard2.0/MedallionShell.dll'
. Please check the diagnostic logs for more information.

Test Run Aborted.
```

At the same time, if we execute `dotnet test` separately for every test project (as it is done on CI currently), then it works.

I don't understand the issue, and it should be fixed.