Description of problem:
for some operations of task service pluggable variable persistence strategy is not used and thus making it impossible to store data outside of the process instance.

Version-Release number of selected component (if applicable):

How reproducible:
use JPA entity as part of process instance that should be stored as regular entity rather than in the bytes of process instance. Make sure that variable is assigned to a user task so it will be stored and available to users working on a task. Use JPA strategy for storage of entities.

Steps to Reproduce:
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Actual results:

Expected results:

Additional info: