Most planes do not have the means to communicate across the entire plane; information in each area is relatively closed off.
When the Void Insect Race invades such a plane, after appearing somewhere, the local natives only consider it a local problem, unaware it's an issue affecting the entire plane.
Moreover, after a problem arises there, they cannot transmit messages to other corners of the world, at most just spreading the news to some surrounding areas.
This leads to the result that in the initial stages of the Void Insect Race's invasion, the nests appear in various parts of the plane, but these places have almost no means of communication with each other, making it difficult for them to unite against the Void Insect Race.
It often takes waiting until the Void Insect Race develops to a certain scale and invades extensively across the plane for the beings on the plane to realize the insect race threat.
