Couple of points:
- Did you review what changes have been added between both versions? This 
is the upgrade guide page: https://jenkins.io/doc/upgrade-guide/
- Maybe, I'm wrong but did you try to 
set hudson.model.ParametersAction.keepUndefinedParameters as true ? Further 
details: 
https://wiki.jenkins.io/display/JENKINS/Features+controlled+by+system+properties
 
. 

Cheers

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