\ + ~ no longer shows layer mask

I'm guessing due to the new ~ to switch to erase, pressing \ followed by ~ no longer shows the layer mask. I had this set to the side button on my wacom pen, and use it constantly, far more than I use the eraser tool, so this is quite a workflow stumbling block for me. Has this shortcut been replaced by a different key or is it just gone? Does anyone know another way to set a hotkey for that? I like to flip back and forth repeatedly as I work, opt+clicking the mask icon each time and having to look away from what I'm doing to find it is quite inconvenient.

Thanks!

OS X Mojave, newest version (21.0.1, I think?) of photoshop