I think I just found a bug in the modeler (ticket already filed). I was doing some refactoring and triggered the "Find usages" function on an entity. To my surprise the results did not contain a microflow where the entity was obviously used. In my case a list of this entity was retrieved by association and then iterated in a loop. Both actions are currently not considered a "usage" by the modeler.
I've created some screenshots of my sample project.
I just want people to be aware of this so you don't miss anything important while refactoring.
I've tested this on 5.21.4 and on 5.6.
Best regards, Georg