Understanding support: why is it needed in this case?

https://preview.redd.it/uhtgvcb98nrg1.png?width=592&format=png&auto=webp&s=63c2ac9c37c8276e39ba51ed7e1470c8995d6a6f

Bambu studio says I have "floating cantilever".

I tried to add a support blocker to understand which part. There are 3 small holes at the back of the object, I expected this to need support, but it turned out the large holes in the front need support. These are basically holes created of scaled spheres. Why would this need support?

What is the support expert take on this?