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I've had a few batches that didn't germinate. A lot of the time, they just did nothing and the next batch was fine. But one got particularly damp and there was no wind for a good while so the whole lawn developed a whispy mold/fungus. That went away too eventually and didn't really harm the existing grass, but it wasn't pleasant.
My grass is hardly growing so I wouldn't fancy the chances of seed getting a decent start.