Default null input parameter not working in CallActivity

[nhuurnink]

When running:
await context.CallActivityAsync<string>(nameof(MyActivity));

[Function(nameof(MyActivity))]
public Task<string[]> MyActivity([ActivityTrigger] string trigger, FunctionContext functionContext)

results in:
Could not populate the value for 'trigger' parameter. Consider updating the parameter with a default value.

Which is weird, since CallActivityAsync is supposed to have a default value for object? input = null.

[jviau]

Most likely related to #2674

[MatLeger]

I have the same problem with default null input parameters. I also have the same problem described in #2674.

[nhuurnink]

It might be related, but I only have the quotes problem when using DurableTask 1.1.0.

[jviau]

Fixed by #2708