I honestly have no idea what triggered this. I was posting this comment and poof.
EDIT: blurred ip
All the numbers, possibly? Might have looked too much like SQL or something. Try changing the numerals to words and see if that makes a difference.
That happened to me too before, with no number. It resolved by itself after a few refreshed and restarting the browser.
This is a 13213 test
SELECT IfYouCanReadThis from ThenIHaveNot, TriggeredThe WHERE Posting='Block'
If it happens again, try copy+pasting your comment and hard refresh your browser. In Chrome you can do this by right-clicking on the refresh icon and selecting "Empty Cache and Hard Reload". That might fix it.
EDIT: I have not triggered the block with this post. Browser: Google Chrome Version 76.0.3809.132 (Official Build) (64-bit).
It might be browser specific - I don't know how spam bots work exactly, but maybe they use a specific browser as their user agent (assuming they post "programmatically" and not with a simulated browser or something, that would be very silly but possible) and you have a very similar agent.