'MigrationSerializer<T>': cannot derive from sealed type 'BsonClassMapSerializer<T>'

'MigrationSerializer<T>.Serialize(BsonSerializationContext, BsonSerializationArgs, T)': no suitable method found to override

'MigrationSerializer<T>.Deserialize(BsonDeserializationContext, BsonDeserializationArgs)': no suitable method found to override

'MigrationSerializer<T>': cannot derive from sealed type 'BsonClassMapSerializer<T>'

'MigrationSerializer<T>.Serialize(BsonSerializationContext, BsonSerializationArgs, T)': no suitable method found to override

'MigrationSerializer<T>.Deserialize(BsonDeserializationContext, BsonDeserializationArgs)': no suitable method found to override

Process completed with exit code 1.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v2, actions/setup-dotnet@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

The type 'TId' cannot be used as type parameter 'TKey' in the generic type or method 'AsyncCursorSourceExtensions.ToDictionaryAsync<TDocument, TKey>(IAsyncCursorSource<TDocument>, Func<TDocument, TKey>, CancellationToken)'. Nullability of type argument 'TId' doesn't match 'notnull' constraint.

Possible null reference return.

Non-nullable property 'ConnectionString' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.