About a month later, Apple fixed the problem in the form of macOS 11.6.7: the new update aims to correct this bug introduced with 11.6. The error described above does not occur on macOS 10.15 Catalina or macOS 12 Monterey.
Download via software update
If you want to get rid of the error immediately, open the system settings for installation. The update can be downloaded and installed in the “Software Update” section. But be warned: even installing small bug fix updates takes between 20 and 45 minutes – depending on the Mac you’re using. During this time the Mac cannot be used.
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