Easymail entity stored but not shown in Send email action

Issue information

From user: arx-e

Contribution record

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I'm not sure whether this should be reported here or in the Easy mail queue but the issue can be observed in the ECA BPMN.io interface.

Steps to reproduce

Create a model in which

1. an email entity is created
2. the field value for the recipient is set
3. and then an action is added of the type "Send Easy Email"

This last action has one field for the entity (easymail entity) on which it should operate.
One can enter the entity name here but as soon as you reopen it ist shows as empty.
The value has been stored though and the model works correctly. It is just not showing in the interface.