Are you referring to the arms disappearing when you switch weapons? The method I showed is an ok solution, but I found out later that the Animator component "culls" (doesn't render) the arms once they're out of view of the camera.
You can change that to always display. You can change the dropdown that says "culling mode" to "always animate". Then it won't cause that issue.
Just to be clear, you're saying the arms don't show up even with "always animate" enabled? I'll have to test this out myself, maybe something has changed. Not sure why the gun would show up but not the arms since it would be affected by the same issue as the arms.
yes that's the case. Please check if it's just me or there's a similar problem for your case as well. Otherwise I'll post link some .gif or post a video for the same