Hey everyone, I got a strange bug here that warps player models.
Not sure if the problem is PAC3, Simple THird Person, or Gmod `act` commands itself, but here it is:

1. Install and enable PAC3 and Simple Third Person addon from the workshop (*very important*, bug won't show without STP enabled.)
2. Start a map and open PAC3, make sure third person view is already enabled. It has to be on before the map loads, essentially.
3. Insert a new Custom Animation into the default "my outfits" group.
4. Hide interface (Ctrl+E) and use `act dance` or any other `act` command.
5. Move the mouse cursor around
6. Voila, character model gets warped!

Did nobody ever know about this? Custom Animation seems like a fairly buggy thing in general.
I'm not sure if this is STP or PAC3's fault, but I thought I'd share this here just in case.