Possible null reference argument for parameter 'item' in 'bool HashSet<MudListItemExtended<T?>>.Add(MudListItemExtended<T?> item)'.

Cannot convert null literal to non-nullable reference type.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'endText' in 'void MudJsonTreeViewNode.GenerateComponent(RenderTreeBuilder builder, string text, string endText, string icon)'.

Possible null reference argument for parameter 'collection' in 'HashSet<T?>.HashSet(IEnumerable<T?> collection, IEqualityComparer<T?>? comparer)'.

Dereference of a possibly null reference.

Nullability of reference types in value of type 'Converter<T?>' doesn't match target type 'Converter<T, string>'.

Possible null reference argument for parameter 'collection' in 'HashSet<T?>.HashSet(IEnumerable<T?> collection, IEqualityComparer<T?>? comparer)'.

The type 'T' cannot be used as type parameter 'TKey' in the generic type or method 'Dictionary<TKey, TValue>'. Nullability of type argument 'T' doesn't match 'notnull' constraint.