Cannot Bake Bone Animation

Question

So I have this bone animation with all the constraints, and I want to bake all the bones so that I can get rid of all the unnecessarry bones and keep my armature clean. Here is what I did: in Pose Mode, I chose all the bones and went pose -> animation -> bake action, as shown here:

And when I clicked OK, Blender said: nothing to bake

I tried to bake again, but this time my target was just one single bone. It worked, which is wierd.

Yet, baking all the bones one by one is not acceptable to me. So, what was I doing wrong? How can I bake all the bone animation at once?

Also, could it be a Blender Version problem? I used to use 3.0.1, but lately I switched to 3.2.2. I remember things uesed to work in 3.0.1, I never got this "nothing to bake" note before when I baked the pose bones animation.

FYI: Here is the .blend file.

Answer 1

I tried on v3.0.0, 3.2.2 and 3.3.0, I couldn't reproduce the issue.
Though, there is a confirmed bug on v3.2.2 that seems to be related to how selection tools fail to select the armature object when selecting bones. More about it there:
⚓ T100879 Bake Action fails with "Nothing to Bake" if the Armature node isn't selected,

Maybe try to first select everything with A, and if you see the armature is still not selected in the outliner: ⇧ Shift LMB a bone to make it active (which should make the armature selected again), and try baking again?