Filter "handle_bulk_actions-users" does not fire

[navepilif]

The filter 'handle_bulk_actions-users' does not fire. Diving into Wordpress' core files (on both 4.7.2 and 4.7.3) reveals that apply_filters() is not even being reached to fire the filter. (Looking at wp-admin/users.php around line 418).

I have disabled all plugins except the one that I am currently building to verify there is nothing causing a conflict.

Steps to reproduce:

1. Add the filter 'handle_bulk_actions-users'
2. Attempt to log "Hello World!" inside that filter's callback function

-or-

1. Just follow the example on ​https://make.wordpress.org/core/2016/10/04/custom-bulk-actions/ -- using this filter name instead