I suspect that the supplemental update had critical security fixes that the 10.15.6 beta 1 did not have (due to timing). So, installing that beta loses the critical security fixes. Probably need to wait for beta 2 which will incorporate the security fixes.
nyjklein
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I have the same question. I'm on Windows 11 and have the latest iCloud for Windows 14.0. iOS tells me I need the latest version of icloud for windows to enable advanced data protection.