I have been taking damage out of nowhere after this update.

I tried clicking everywhere around me in hopes of hitting the mob even if I could not see it, but in vain.

Next I brought my doggo near me, hoping that it would attack that invisible mob that's harming me. Indeed it did!!!! Apparently it was an invisible spider that was attacking me.

Now image a creeper just casually decided to go invisible and blow up behind you back or any other build you are working on.

The screenshot proves nothing, but that is how I found out it was a spider attacking me. It dropped a string after my dog killed it.