This shouldn’t be too surprising because it will likely be months before North Korea’s scientists are able to asses the data and repair whatever went wrong with their previous space launch. Additionally they likely have to build another satellite to put on top of the rocket:

The office of President Yoon Suk Yeol said Sunday it is not letting its guard down even though the window for North Korea’s satellite launch has expired, as the country can go ahead with a launch at any time.
North Korea had set a period between the start of May 31 and the start of June 11 as the window for a satellite-carrying space rocket launch. The country fired the rocket on the first day of the window, but the launch ended in failure with the rocket crashing in the Yellow Sea.
Yonhap
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