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Steps to reproduce:

bootstrap a default an engine
bootstrap a second engine (with the name "engine1")
deploy a process application using engine-cdi
the process application should contain a process that has an output parameter with the following expression
```
execution.processEngineServices.identityService.currentAuthentication.userId
```
login in Tasklist by using the "engine1" (don't login in Tasklist with the default engine)
start a process instance
complete the user task

Observed Behavior:
The expression is resolved to null

Expected Behavior:
The expression is resolved to the authenticated user.

Hint:

In [1] the programmatic bean lookup returns the identity service of the default engine

Possible Solution:

In [1] there should be a check whether the base is null, only then the programmatic bean lookup should happen.

In context of engine-cdi, nested usage of identityService in EL-Expression returns always the identity service of the default engine