This is highly limiting and impacting.
Light Agents need the ability to prompt a full agent to take action, but if they can't tag (@name) agents in Internal Notes no one will receive the action prompt to pick up the ticket.

Please note that ZenDesk is contradicting itself by saying "Light Agents can't do this because they would add the agent as CC, which is outside of their abilities". This whole thread is referring to Internal Notes! Internal Notes do not cause CCs.

The setting "adding the tagged agent as CC" can further be turned off in the Admin Center.

Please advise asap on when Internal Notes tagging for Light Agents will be reestablished.