PrtScrn Key Won't Work Twice - How to Clear Clipboard?

[Microsoft Windows]

After copying and saving part of the screen using the PrtScrn key and the snipping tool, the PrtScrn key won't work again. But Win-shift-S always works.Apparently PrtScrn can't overwrite the clipboard, because copying a bit of text to the clipboard revives the PrtScrn key.Is this a bug? Or is there a setting that will stop this?I can create my own PrtScrn key by setting a programmable key on my keyboard to enter Win-shift-S. But that shouldn't be necessary.

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