In the CSS Mini Project my students lost their HTML and CSS from earlier in the week. This is the second time this has happened. I made sure everyone was in 22-23 Code Studio and looked under their names in the Teacher Dashboard but everything was gone!
Were you also unable to find it using version history? I had something similar happen with one of my students in Unit 2. You may need to put in a problem ticket for it. Here’s a support article for reporting a problem.