Since the very beginnings of Hibernate the timestamps cache received invalidations whenever a query is executed. See https://github.com/hibernate/hibernate-orm/blob/d8d6d82e30960e0c255950eaf875ad48831b12b0/code/core/src/main/java/org/hibernate/engine/ActionQueue.java#L176

Your frequent writes to disk are a probably due to a misconfiguration. The timestamps cache should not be configured to store on disk but should stay in-memory.