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Why notes are hidden on some devices
Notes with tags or mentions can only be viewed on a device with iOS 14.5, iPadOS 14.5, or macOS 11.3 or later. If you or another participant adds a tag or mention to an iCloud note, that note is not visible with an earlier version of iOS, iPadOS, or macOS.
If you delete the tag or mention, the note appears on all your Apple devices again.
When you first add a tag or mention to an iCloud note, an alert tells you if you need to upgrade any of your devices to be able to view the note. To upgrade your devices, see any of the following Apple Support articles: