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Reply to macOS CatalinA -Who knows this message (hard disk utility first aid) - Warning: MT mapping is not completely referenced?
Count me in with the same issue. And, I too suspect the fusion drive is at fault. I've had to rebuild my hard drive (3 TB Fusion) twice on a 2019 iMac 27" 5k model fully loaded. This is complete unacceptable so I'm taking it back to Apple under AppleCare and insisting on a complete replacement of the 3 TB Fusion drive. Disk First Aid, and the troublesome APFS/containers confusion, always reports this error. How do I know there is a problem? Finder slows to a complete crawl...beachballing...the computer becomes unusable. Couple in "snapshots" and "Time Machine" either capturing the bad blocks or replicating them on restores, and I'm left praying for Steve Jobs incarnation, you know, when Apple "just worked."
Jun ’21