Haven’t seen that issue. However, I have seen an issue going back to Sept 2022 where the chat is slow to populate and which remains unfixed. A 3rd party has written a script to fix the issue. Recently the entry box at the bottom disappears and reappears on its own.
The blanking of the text entry box is so bad that I could not chat properly during a live stream today. I have never seen a browser with so many YouTube chat issues as Brave seems to have,
I am trying Firefox which has neither of these issues.