How do I disable a shortcut file shortcut key that was already removed?

I set the "Shortcut key" in the Properties window of Windows' Snipping Tool to CTRL+SHIFT+4, but I have since installed ShareX and I tried to set the CTRL+SHIFT+4 to ShareX and I removed it from Snipping Tool. However, whenever I press CTRL+SHIFT+4, Snipping Tool still opens even though it's "None" in the Properties window. How do I remove this shortcut? Is there a registry key I can delete?

I also tried to change the Snipping Tool shortcut in the Properties window to CTRL+SHIFT+2, but it still only respects the first shortcut.