The job was canceled because "ubuntu-20_04_DevEx" failed.

The operation was canceled.

A FrameworkReference for 'Microsoft.AspNetCore.App' was included in the project. This is implicitly referenced by the .NET SDK and you do not typically need to reference it from your project. For more information, see https://aka.ms/sdkimplicitrefs

Possible null reference assignment.

Nullability of reference types in type of parameter 'x' of 'int TxComparer.Compare(Transaction x, Transaction y)' doesn't match implicitly implemented member 'int IComparer<Transaction>.Compare(Transaction? x, Transaction? y)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'y' of 'int TxComparer.Compare(Transaction x, Transaction y)' doesn't match implicitly implemented member 'int IComparer<Transaction>.Compare(Transaction? x, Transaction? y)' (possibly because of nullability attributes).

Converting null literal or possible null value to non-nullable type.

Possible null reference return.

Possible null reference return.

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'item' in 'bool SortedSet<Transaction>.Remove(Transaction item)'.

Cannot convert null literal to non-nullable reference type.