JRE install clears out all existing Java Runtime parameters for older JRE's

FULL PRODUCT VERSION :
1.6.0_10

ADDITIONAL OS VERSION INFORMATION :
Windows XP SP2

A DESCRIPTION OF THE PROBLEM :
Installing JRE 1.6.0_10 clears out all previously saved java runtime parameters for existing JRE installations

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
With an existing 1.6 jre installed, set some Java Runtime Parameters and save them. Now install 1.6.0_10 beta. Go back to the control panel and notice all params are now missing

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Should retain existing parameters
ACTUAL -
Cleared out all parameters

REPRODUCIBILITY :
This bug can be reproduced always.