Processes launched from "su -" are not closed when killing terminal

I have a question regarding the processes launched via a SSH session, after having performed a su - user. My question applies to RHEL 8, but might as well to other O/S. The SSH connection is initiated from a Windows machine, but the behavior is the same when initiating a SSH connection from any other means. The use case is the following: - log as user via SSH - perform

sudo su -

to switch to root - execute sleep 3000 - kill your SSH terminal (like close the mobaxterm window) In this case, the process sleep 3000 keeps running. This is not specific to the root user. If I switch to the activemq user with su - activemq, I have the same behavior. However, if I run the command sleep 3000 from the user I used to connect via SSH without performing the su -, killing the SSH terminal also kills the process, as expected. Is this an expected behavior? And is there a way for this to prevent happening ?