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This is not the first time but many times I've encountered this problem. There is no 'edit' option below the question as it usually is. Here's the screenshot:
What might be the reason for this?
As @Brahadeesh notes, the question already had a pending suggested edit, which can be seen from the question's timeline:
You would have been able to see the pending edit if you switch to the responsive mode with the 'full site' link at the bottom of the page.