User/Channel Autocomplete not working in Your Message on New Discussion Popup Diaglog

Description:

When creating a new New Discussion topic, on the Create New Disussion Popup Dialog, the Your Message field does not all the autocompletion of Name/Rooms and/or Channels

Steps to reproduce:

1. On the Web Client goto any Channel
2. Click on the + sign and Create New Discussion
3. Click into the "Your Message" field/box
4. Try to type a user using @ or a room using #

Expected behavior:

In normall message fields/box the @ and/or # would provide an autocomplete of names/rooms as you type.

Actual behavior:

Nothing happens.

Server Setup Information:

• Version of Rocket.Chat Server: 5.4.3
• Operating System: Ubuntu
• Deployment Method: Droplet on Digitial Ocean
• Number of Running Instances: 1
• NodeJS Version: v14.19.3
• MongoDB Version: 5.0.12 / wiredTiger (oplog Enabled)

Client Setup Information

• Desktop App or Browser Version: Google Chrome Version 110.0.5481.177 (Official Build) (64-bit)
• Operating System: Fedora 37

Start by locating the web client's Create New Discussion popup and its Your Message field, then compare it with normal message fields where @ and # autocomplete works. Reproduce the issue using the listed steps and verify that user, room, or channel suggestions appear while typing in the popup.