So this is what text with a black highlight (mark) looks like in chat when the window is visible.
This is what it looks like after the chat has faded away and made everything not visible. The highlight (mark) is still visible despite everything else in the chat window being invisible.
(By the way this is done using rich text. IE: "<mark color='#000000' transparency='0.7'> MESSAGE GOES HERE </mark>"
EDIT: I realize that if you click the button to hide chat it makes it go away. But if you let chat fade away that’s when the issue occurs.
Expected behavior
I want roblox to fix this and make it so the highlight (mark) goes away with the chat. (When the chat window fades away, the highlight (mark) should fade away as well.) and when the chat is fully hidden so should the highlight (mark)