Is it normal?

That's normal! My autos got that too, that's little calyx that grows close to the node, they are good.😉

So they always contain a very tiny light green/white thingy in it? Thank you for your time guys :)

Those would end up being seeds if they were pollinated. You can smoke them. Basically that's what marijuana flowers are. Simply stacked clusters of calyx waiting for their pistils to get dusted with pollen. When this occurs the pistils will retract back into the calyx and the process of seed creation begins. The seed will form within the Calyx and the "sack" will crack open and the seed will drop out.

I think its an unfertilised seed/ovary but i dont know if i have to worry about…

hardened ovules can occur with older plants and some genetics, or they are immature seeds.

Ah I misunderstood, yeah they're underdeveloped seeds from a late pollination. Hopefully it was just a small portion that got hit. Was probably a banana hiding in the mix.

If their is a mini immature seed in there that's not normal but also not bad. If it is mostly hallow then its normal.

Yes the calyxe but when i open them they are not totally empty i found something like an imature seed

Those are calyxes. More the "womb" where seeds can develop to borrow from the lower analogy. If they are empty, then you succeeded in growing sensimilla(seedless) cannabis.

U mean those littlest weird dots right? Got them often if not every time after each harvest. I'm kinda sure there is good answer somewhere in the internet. For me, it's some of sort of embryos of not-developed seeds.