These tiny vents in these crackers allow steam to escape during the baking process, preventing the crackers from rising like other biscuits or bread, and minimizing bubbles.
This evaporation will help thin the cake, flatten it into the shape you initially saw, and create a certain amount of brittleness.
However, it is not only necessary to make a miscellaneous hole anywhere in the cake! When making, the flour and cake will be leveled according to the designed mold. According to the size and type of cake, people will arrange the density and the distance between the holes together.
If the holes are too close, the filter cake is easier to dry because the steam evaporates too much.
Conversely, if the hole is too far away, the cake will float with small bubbles that cannot escape because the steam tries to escape. The result is a cake that easily deflates-looks "very flawed".