The "--output" option isn't supported when building a solution. Specifying a solution-level output path results in all projects copying outputs to the same directory, which can lead to inconsistent builds.

Argument of type 'Task<IEnumerable<SubtopicRecommendation>?>' cannot be used for parameter 'value' of type 'Task<IEnumerable<SubtopicRecommendation>>' in 'ConfiguredCall SubstituteExtensions.Returns<Task<IEnumerable<SubtopicRecommendation>>>(Task<IEnumerable<SubtopicRecommendation>> value, Func<CallInfo, Task<IEnumerable<SubtopicRecommendation>>> returnThis, params Func<CallInfo, Task<IEnumerable<SubtopicRecommendation>>>[] returnThese)' due to differences in the nullability of reference types.

Argument of type 'Task<IEnumerable<Section>?>' cannot be used for parameter 'value' of type 'Task<IEnumerable<Section>>' in 'ConfiguredCall SubstituteExtensions.Returns<Task<IEnumerable<Section>>>(Task<IEnumerable<Section>> value, Func<CallInfo, Task<IEnumerable<Section>>> returnThis, params Func<CallInfo, Task<IEnumerable<Section>>>[] returnThese)' due to differences in the nullability of reference types.

Argument of type 'Task<IEnumerable<NavigationLink>?>' cannot be used for parameter 'value' of type 'Task<IEnumerable<NavigationLink>>' in 'ConfiguredCall SubstituteExtensions.Returns<Task<IEnumerable<NavigationLink>>>(Task<IEnumerable<NavigationLink>> value, Func<CallInfo, Task<IEnumerable<NavigationLink>>> returnThis, params Func<CallInfo, Task<IEnumerable<NavigationLink>>>[] returnThese)' due to differences in the nullability of reference types.

Argument of type 'Task<Question?>' cannot be used for parameter 'value' of type 'Task<Question>' in 'ConfiguredCall SubstituteExtensions.Returns<Task<Question>>(Task<Question> value, Func<CallInfo, Task<Question>> returnThis, params Func<CallInfo, Task<Question>>[] returnThese)' due to differences in the nullability of reference types.

Argument of type 'Task<IEnumerable<Page>?>' cannot be used for parameter 'value' of type 'Task<IEnumerable<Page>>' in 'ConfiguredCall SubstituteExtensions.Returns<Task<IEnumerable<Page>>>(Task<IEnumerable<Page>> value, Func<CallInfo, Task<IEnumerable<Page>>> returnThis, params Func<CallInfo, Task<IEnumerable<Page>>>[] returnThese)' due to differences in the nullability of reference types.

Remove this unnecessary check for null. (https://rules.sonarsource.com/csharp/RSPEC-2589)

The "--output" option isn't supported when building a solution. Specifying a solution-level output path results in all projects copying outputs to the same directory, which can lead to inconsistent builds.

Argument of type 'Task<IEnumerable<SubtopicRecommendation>?>' cannot be used for parameter 'value' of type 'Task<IEnumerable<SubtopicRecommendation>>' in 'ConfiguredCall SubstituteExtensions.Returns<Task<IEnumerable<SubtopicRecommendation>>>(Task<IEnumerable<SubtopicRecommendation>> value, Func<CallInfo, Task<IEnumerable<SubtopicRecommendation>>> returnThis, params Func<CallInfo, Task<IEnumerable<SubtopicRecommendation>>>[] returnThese)' due to differences in the nullability of reference types.