Pins appearing before bag fully colonised

I inoculated my all in one grow bag last month, and a portion of the substrate near the top of the bag had begun to colonise as expected

Looking at it today, I noticed that the colonised area has started to pin, but a large area of the the substrate has not even colonised yet (so I hadn’t even got round to dunking it yet, etc)

Any advice on how to proceed? Should I dunk the not-yet-colonised substrate? Should I just wait and see? If I harvest the small area of growth when it’s ready, will this compromise the rest of the substrate?