Only custom rewards that raise. chat message from thr user being prompted to enter text will create a chat message that should have that tag.
So not all rewards will appear in chat as a message.
I expect you are looking forr a reward that doesn’t raise a message. And thats what you are missing.
For rewards you are really looking at pubsub or eventsub, not chat for full coverage/all types of custom rewards.
This actually wasnt documented in the first place, so its not removed from the docs, just never added if it was intended for us to use anyway in the first place