New tab in sheets is not listed in the source

I added a new tab in my sheets as well as on the app. However when I click on source so it’ll link the sheet, the tab name is not listed there. Anyone know why or what I need to do?

Did it ever appear? Did you refresh the app builder? It take a minute for new changes to appear in the app.

Is there any content in the new sheet? You need at least one header.