Currently, in Adaptive mode, the General feedback is never displayed during the attempt, which can be awkward in some situations. This affects all question types.
The issue has been discussed in the quiz forum post 386755.
It is proposed here to display the General feedback during the attempt when the following condition is met:
[General feedback is selected under 'During the attempt' in the Review options]
[The student has a correct answer
The total penalties for the question has reached its maximum value]
Simply put by Tim Hunt:
So, my suggestion is to show the General feedback (if the options is one) when either _rawfraction is 1 or _try * $question->penalty is >= 1.
Tim Hunt also commented that ... this is most consistent with what happens in Interactive mode.
The above condition would be appropriate in all cases: correct answer, partially correct answer, incorrect answer, and all the values of the 'Penalty for each incorrect try'.
Of course, in the Review options, General feedback under 'During the attempt' must be selected. Otherwise, the General feedback will not be displayed during the attempt.