When using ModalHolder, the transition animation is missing. I think the update logic for ALREADY_MOUNTED should be modified to match the return logic of the create HOC. Specifically, ALREADY_MOUNTED[id] should only be set to true when shouldMount is true.

When using ModalHolder, the transition animation is missing. I think the update logic for ALREADY_MOUNTED should be modified to match the return logic of the create HOC. Specifically, ALREADY_MOUNTED[id] should only be set to true when shouldMount is true.