I'm facing an issue with bulk editing in my .NET application using NHibernate. When I update field X after starting the application, it works fine. However, when I try to update another field using bulk edit, NHibernate generates the same UPDATE query as before, but assigns the new value to X instead of updating the intended field.

I'm using an Update function that accepts a lambda expression. The function starts by opening a stateless session and closes it after the update. My NHibernate configuration has both first-level and second-level caching disabled.

I've tried the following, but the issue persists:

Using transactions

Opening a session and calling Clear() before updating

Ensuring caching is disabled

Despite these attempts, NHibernate always generates an UPDATE query targeting X, causing incorrect values to be stored in the database.

How can I resolve this issue?