so, why would you expect someone to watch you get in a position of certain victory, while they sat idly by due to a truce...
You do not. You gave a notice, then after waiting one or 2 rounds as planned, you then attack the one you had a truce with.
The C&A report for truce breakers, if anything, indicate that truce breaking is so rare, that when it happened, the "victims" of the truce breaking believe it's against the rule

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I am using tons of truce and have maybe witnessed only twice during my CC time a truce breaking. Truce breaking without giving notice is definitely not the rule here on CC. People disliking truce, yes there is, significant amount of them, but truce breaker, not that many. Let's give the real picture to this newcomer in the forum.