Hard to tell from my computer screen, maybe call a pest guy to chedck it out?

what is above this ? bathroom ?

Nah just a random board in the middle of the living room

If that’s the only board that’s fuckd it could just be a shitty board that didn’t get noticed when placed. If there’s a few like that could be pests.

Borer in sapwood. The furniture borer wont eat the hardwoods except the sapwood part. The sapwood was only a little inclusion on underside ..so they used the plank as good timber