Yes, that's what I'm saying. Most shrimp pattern and color genes are recessive, meaning both parents need them in order for offspring to express them. So in order for that to happen, you have to breed f1 generations together.
You won't have Bengal in f2, it'll be red tiger or tt dominated, not shared like f1.
You should keep these shrimp anyway because there's no guarantee they'refertile or free of defect either since they are a true cross breed (iinterspecies breeding)