When a change request approval is rejected, the change request moves to state is scheduled rather than canceled.
Istanbul Patch 11a
The task closer business rule on the task table is triggered and sets the state to 3 (Closed complete). However, the change request state values has been customized where 3 is scheduled.
As reverting the state values to out of box would require a lot of rework in the instance, the task closer business rule was modified to exclude the change request table.