On one of our last dives in Timor Leste, we went through an area where there were dozens of these tiny little anemones. I am not sure if they are just a very small species or if they were indeed babies/juveniles. I lean towards the latter explanation since many of them seemed to be in rather unlikely locations (like the ones below attached to some algae and a sponge).
Anemones are not permanently attached, and some can even do a rudimentary form of swimming, so if these are juveniles, hopefully they found better locations and settled down to a nice long life.