We have a dashboard that has the same problem, it looks like a new bug perhaps, since we did not have this problem before the last week or so. We have a related table with guid to globalId attribute match in the action. I can see from the network tool in firefox that the query where tag appears to be incorrect it looks like this
where=GlobalID = undefined
It should, I would assume be using the guid value in our case.
The dashboard editor allows the action with the attribute to be configured ok, seems to be in the editor or code.
Noticed we just got an email regarding an AGO update, wondering if this is a bug introduced from the update?