I wanted to to delete pages under the same Page:NAME but can not do, even though Special:PrefixIndex turns out fine.
Unfortunately this report lacks some information. If you have time and can still reproduce the problem: Please add a more complete description to this report.
That can be a clear list of specific steps to reproduce the situation, as little details sometimes matter, so that nobody needs to guess how you performed each step, describing actual results and expected results after performing the steps to reproduce, providing a link to a public website where the issue can be seen, MediaWiki version information (if it is not on a Wikimedia wiki), etc.
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Ideally, exact and clear steps to reproduce should allow any other person to follow these steps (without having to interpret those steps) and see the same results. Problems that others can reliably reproduce can get fixed faster.
Also, I don't understand how the task summary is related to the task description and how that is related to the project tags of this task.