I have a suspicion that there are more mangas that feature 'spy' as a title/job of the main character, not big titles (or particulary good), but i think there might be a surge in popularity for the concept:
YOZAKURA FAMILY (family of spies)
Spy X family. (didn't read, just saw the title)
"The World Is Overflowing with Monster, I'm Taking a Liking to This Life " (reverse isekai, dude gets the job title 'spy')

(and probably some more).

is this just a coincidence, or is there a trend?