Error message when editing an ECA module:
Warning: Array to string conversion in Drupal\eca_modeller_bpmn\ModellerBpmnBase->optionsField() (line 920 of eca/modules/modeller_bpmn/src/ModellerBpmnBase.php)
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Code
I have edited the Plugin EntityFinder, on line 386 and invalidated the PHP with an implode() function on getLabel.
With that, the warning about Array to String on editing ECA models, disappeared.
Solved on the related issue