I was surprised to be the only one mentioning blocks disappearing after switching tabs. Now I think I know why. It’s because I use the zoom to show the text in the app bigger. I have bad eyes so I need to increase the text size with Ctrl +. So now I think you can repeat the bug. You switch to a different tab then come back and the block you were working on is not here. You have to scroll up and down several times to make it reappear. The longer the code is the longer it takes to make it reappear.