Get-Mailbox always returns AuditEnabled set to true

Hi y'all!
Has anybody had an issue with Get-Mailbox command in the sense that AuditEnabled property is always set to true?
Even when I add a filter for that property -AuditEnabled -eq $false, the resultset is correctly narrowed (contains the right number of records) but every record returned has AuditEnabled set to true.

I refer to Exchange Online.