R6 has confirmed on reddit that Clash and Deployable Shields will be removed again due to glitches.
Clash and Deployable Shields have been removed yet again. Clash has been removed because there is a glitch with her barbed wire and her shield. If you deploy both things at the same time, you'll be completely invincible from the front of you. In your prospective your character would be normal but in another person's POV clash would have her shield on and could shoot through her shield. Link to reddit post https://www.reddit.com/r/Rainbow6/comments/c0a8wm/update_on_the_clash_and_deployable_shields/