Normally, due to the different rules of session division between GA4 and UA, GA4 has fewer sessions than UA.
But in fact, there will be more sessions in GA4 than UA, and there will be a lot more rhythm. For example, the sessions of GA4 are 100,000, while the sessions of UA are only 40,000. There is a big difference.
What is the reason?
GA4 session information is stored in Cookie _ga-CONTAINER,.
Some Cookie Consent will have such a mechanism, if Cookie _ga-CONTAINER is not added to the white list of Cookie Consent, it will automatically clear the cookie, if Cookie _ga-CONTAINER is cleared, it will generate a new one, it will be regarded as a new session .
If page B is accessed from page A, the value of Cookie _ga-CONTAINER is different. Pay attention to the session ID, the value is different, so it will be regarded as a new session.
This type has a characteristic that the number of sessions will be close to the number of PVs.