Are all this plant's buds are affected?

Yes, but only one potted plant. My plants that are in the ground are covered in perfect buds.

I did find one separate plant with signs of worms inside the bud and black frass just outside the bud, but not along the delicate bud stem like this.

I have occasional new basals or buds that get that damage from critters. I don't do anything. You could move the pot closer to bird helpers who could eat the critters.

Thank you Sheila! I was afraid as I’ve never seen this before, huge relief to know you have had similar experience. Thanks again!!

What sign signaled the presence of worms inside the bud (of the separate plant)?

Similar leaning buds, but primarily the black frass at the hole.