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Since JMIElementCookie was introduced just as a workaround and it is going to be removed please remove its usage in java bridge and clazz module.
I have removed JMIElementCookie from java bridge and clazz module. It is still present in OverrideAction and OverridePanel2 (java module), where the cookie is used to obtain jmi element for a given Node.
That's ok, node usages will be solved with issue #49731. I think we can consider this as fixed.