I updated to 10.15.4 a while ago, but the software update red (1) notification has not gone away in system preferences, despite many restarts since then. What could be the problem?
When I click software update it says my Mac is up to date. The notification appears as a red number icon in the dock and when I click the apple in the top left corner.
Sometimes you have to wait a bit after it says your Mac is up to date. I have had that happen on several occasions and waiting an additional 2 or 3 minutes brought up a statement that an update was waiting to downloaded.