Multiple methods call java.lang.Throwable.printStackTrace() instead of properly logging an error with the exception as parameter. This causes the error to be logged as "INFO" and to have [STDERR]: as prefix.
Try to reproduce one of the following bugs
Important: These are not the only occurrences of this bug, they are just examples. Who ever fixes this should search for all occurrences of java.lang.Throwable.printStackTrace(); there are also multiple in the realms classes.