Steps to Reproduce
With List v3 enabled, navigate to incident_list.do.
Open the condition builder and note that the Keywords field is selected by default.
Change the default condition to anything other than the Keywords field, for example, select Assigned to.
Try to change the field back to Keywords again.
Note that the field does not change back to Keywords.
Delete the condition and add it again to regain access to the Keywords field.
Related Problem: PRB724792