This should explain it:
[Developer Changelog] KRT16O To KRT16S, Critical Bug In Full-Disk Encryption Explains Hotfix
[Developer Changelog] KRT16O To KRT16S, Critical Bug In Full-Disk Encryption Explains Hotfix
However, there is one emergency fix for a serious bug that could result in the loss of access to encrypted disks on a device upgrading from 4.3 to 4.4.
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