Formats: False does NOT find 'Missing' formats (as reported by Maintenance).
'Missing' implies Calibre THINKS there are supposed to be those formats ( DB entry exists)
formats: false finds KNOWN 'Empty Books' (details with no formats) AS CREATED with Calibre
2 typical causes of this error
1) Using the OS to make ANY change to a files name or presence
2) Running the Library in 'the cloud' / net share
(Dual boot Win/Linux will also cause EXTRA books at the same time due to case issues )
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