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Without knowing which addon you are talking about, it's pretty much impossible to give you any useful/relevant information.
About all I can tell you based on your extremely vague post is that no, there is no known bug that randomly causes a single frame not to receive an event that all other frames listening for do receive. The only situation I can think of under which this could occur would be if you had another addon that intentionally unregistered the event from the addon's event-listening frame(s).
The more likely scenario, however, is that the addon in question has a bug.
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