Pokecube, 1.20.1, 1-3.24.0.i
https://www.curseforge.com/minecraft/mc-mods/pokecube-aoi

I'm not sure you need the log for this, but I'll do it if asked. I'd generate one now, but I'm really tired and about to go to bed, to the point where I can't be bothered to get the VR stuff going right now.

Issue Description:
I don't know if this is on your side or Pokecube's side, but the core feature of the mod, the Pokecubes, don't work.

The titular 'Pokecube' item, filled or not, cannot be used. It cannot be thrown, holding the right-click button just leads to your right arm pulling back and forth like it's trying to throw, but nothing happens.
It's also attached to your left hand, and huge, for whatever reason. Switching to third-person item transforms changes nothing that I noticed.

To reproduce, install Pokecube AIO and Vivecraft, then simply hold a Pokecube and try to use it.

Screenshots:

Going back to non-VR, everything works as intended:

If that ends up being the problem, is there a way to configure that setting per-item?

it's probably a bow item, so you need to change
options > vr settings > interaction settings > roomscale bow
to vanilla only

not right now, but I can add a datapack tag for items to exclude

Okay, that worked!
The items are still slightly misplaced and mis-scaled in the hand, even with third person transforms, but it's functional!

how far off is the scale?

at least it looks like that in the first post screenshots

This far:

Here's my held Pokecube next to a Pokecube in-world:

I can't quite tell if the placement is also off when it clips in to my hand, or if that's just because of the scale.

you forget that that hand model is as big as a block

Nah, I was flying.
The hand model itself appears unaffected.

I mean the vanilla screenshots

It's not obviously that big, at least.
It may be scaled inappropriately in the model, just looking right from the fixed first-person perspective. I,E further away than it should be and big, so it still looks normal-sized.