Caused by some changes on i3-wm we have to update EOS-update-notifier to show updates again on i3-wm setups. Please run this two commands as normal user to proceed the changes.
It is mainly a change for i3 and other WM setups but it is recommended for everyone to use this two steps to make sure using latest changes.
If your notifications about system updates are working as expected, then not really mandatory to run those commands. But shouldn’t hurt either, unless you have made big changes to those service files.