Brief summary of the bug. What is it ? Where is it ?

When an external variable has been ingested, it is stored to the process instance. When an updated value for that same variable has later been ingested, the updated variable value is not stored as expected.

Steps to reproduce:

1. Ingest a variable individually or as part of a batch.
2. Update this variable value in a subsequent batch
3. Observe the old value on the process instance

Actual result :

The previous value remains stored on the variable as part of the instance

Expected result:

The latest ingested value is stored as an update on the variable