FileVault2 & no supported helper partition to update

While a workaround for a problem I had fixed the issue, the root cause remains.
I am using FileVault2 full disk encryption. It seems on my system the kernelcache never gets updated after the drive has been encrypted with FileVault. To be exact: The kernelcache on the helper partition 'Recovery HD' never gets updated. The kernelcache in
/System/Library/Caches/com.apple.kext.caches/Startup/kernelcache
gets updated correctly. What's missing is the part to transfer an updated kernelcache to the helper partition. The last lines of output from
kextcache -v 6 -update-volume /
are
Created prelinked kernel //System/Library/Caches/com.apple.kext.caches/Startup/kernelcache.
CSFDE property cache does not need update.
/: no supported helper partitions to update.
So the kernel cache in the encrypted '/' partition is updated, but since there are 'no supported helper partitions to update', the new kernelcache is not copied to the location which is used during boot. At boot, the kernelcache from the helper partition is loaded. Its location is
/Volumes/Recovery\ HD/com.apple.boot.S/System/Library/Caches/com.apple.kext.caches/Startup/kernelc ache
For some reason the helper partition does not seem to be associated with my encrypted root partition. Does anyone know how to associate my helper partition with the encrypted root partition again?
Here is some background about my system and how I installed it:
My Mac has one internal disk. I use it for Time Machine backups only. It is not possible to boot from the internal disk. My system disk is an external SSD connected via USB 3.0.
I installed the system disk by holding CMD-r during boot to get the Mac into Recovery Mode. With Disk Utility I erased the SSD completely, left Disk Utility and installed OS X Mountain Lion 10.8.3. When the installation was finished, I created a temporary admin user and used Migration Assistent to migrate all User accounts and programs from a backup. Then I logged into my user account which Migration Assistent had created, deleted the temporary admin user and activated File Vault. Later, I installed an upgrade for a program that uses a kernel extension. After every boot I got the message, the version of the kernel extension did not match the version of the program. While everything in the encrypted '/' partition had been updated correctly, the kernelcache on the Recovery HD had not. While I can copy the kernelcache to the helper partition manually, I think this a hack and it should happen automatically when the kernelcache is updated in the '/' partition. I am not aware having done somthing that could make Mac OS X loose the association between the '/' partition and the Recovery partition.

Yuo can't "undo" the update. Bose support may be your best bet.

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