My 8 week old Goldendoodle uses a litter box. Is this OK or is it preventing him from learning to hold it?

Hello. I have an 8 week old Goldendoodle puppy who I have been crate training. When I first got him he was perfectly happy going to the bathroom in his crate and then sleeping in it. I got him on a routine of going outside and he is doing better. I put a litter box in his crate for him to use during the night and during the day when I am at work. He does a great job using it, and not going on the floor of his crate. My question is, is this preventing him from learning to hold it? Is it ok for him to use the litter box in his crate during those times? I'm afraid if I take it out he will go back to just going on his crate floor.

Thank You!