Conditional Formatting Report Column Key Already Exists Error

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I have created a number of reports that use conditional formatting on the some of the columns to display images.  When I create the next conditional format rule for the column and attempt to add the image, I get an error: "key already exists in collection: Report.1013.False".

Fix: What I have found is that if I save my first conditional format rule on the report (save report), logout, login, then I can make my next conditional format rule with image, and save - it works.  I have to logout and login for each additional conditional column format rule that includes image.