Linux just doesn't tell you when you need to reboot. You (or the package manager) has to know that updating something will affect a library that a running program has loaded, and you need to restart it to actually patch your system.

Some package managers handle it better than others, but the popular idea of "never need to restart to update" is super misleading when the reality is "updates on disk, doesn't update in-memory unless you restart that program". Windows' file locking system is really inconvenient, but it does have some knock-on benefits.