Reproduce by opening the launcher without any internet connection.
The expected result would be that the launcher would use 1.18's cover art, but this isn't the case as you can see with the attached image
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This isn't an issue about being able to connect to the Internet with the Minecraft Launcher; rather, when the user is in this "offline mode", the background image in the Launcher is outdated (from 1.17, instead of 1.18).
Did you check your firewall settings? Or (another way to word it/do it) did you decline any firewall notifications to allow the Minecraft Launcher to access the internet?