First of all, it may be that they are checking the condition of the hive or repairing it. Bees can identify potential dangers, such as threats from predators, by sensing the vibration and temperature changes of the hive. Faced with such a threat, the wasp may try to protect it by repairing the hive.
Secondly, wasps may also be adjusting the temperature of the hive. The wasp can control the temperature of the hive by crawling and flapping its wings. This is very important for maintaining suitable incubation temperature and larval growth environment.
Finally, this behavior may also be related to the social interaction of wasps. In wasp society, different positions and structures on the hive may have different social significance. When a wasp crawls on a hive, it may send out chemical signals or touch other wasps to convey information, such as food sources or danger warnings.
It should be noted that the behavior of wasps may be different due to species, environmental conditions and specific circumstances. If you are curious about this behavior, it is recommended to consult a professional entomologist or observe more research on wasp behavior.