@Gloryon it depends on your chat settings for the individual message.
If this doesn't help, can you provide more details about what is happening? Are they trying to type to everyone and it doesn't appear? Can they see the text? Are they attendees or presenters or both? How many people is this happening to? Does it happen regularly, or just once? Any other details that may help.
Based on the details provided I would have to assume that the chat messages that are not being seen by everyone were sent only to the organizers or privately to another meeting attendee. At the start of the next meeting, I would instruct the attendees to make sure they select the Everyone option at the bottom of the chat before sending.
GlennD, You are a little wrong, the problem is that the person does not see the general chat at all...it's like something broke in the code and it just doesn't display the messages.
@Gloryon could you share a screenshot of this to show us what they are seeing?
That's what they see, although the chat is lively during the conference. That is, they do not see the messages of other participants
@Gloryon thanks for the screenshot. I'm not sure what's going on here, and would like to see if I can reproduce it. Could you provide a few more details? How many people is this happening to during a session? Does it happen on every session? What type of device are they using?