I agree with OldBaldGuy. There shouldn't be a problem, especially since the cord wasn't stressed while knotted. ....And even then, not a problem in my opinion.
Most of the time we're not depending on paracord to support it's tested weight, such as in climbing, rappelling, etc. It's reserved for more mundane tasks and less for "life support". Even then, I think I might be concerned like you were, because we never know how we might have to use that stuff someday.
DON'T BE SCARED