My Power App works fine in development and preview mode. I can either hold [ALT] or preview the app. Navigation works fine. lists populate with data. Icons look good.
I notice problems right away when I publish and run the application. I am using the default form. I have duplicated that form three more times in my app.
I have a logo image file on the main screen in design mode. No icon shows when running the app from the published tab.
Each screen can open but the icons on the top are missing or are rotated at very odd angles.
My list of items on the left shows no entries. There is a scroll bar, but just moves through an empty list. I thought I could click in the white space and something would select, but nothing changes in the record panel on the right.

I have published, saved, published again. Nothing changes the behavior. I can use Teams on different computers and get exactly the same results.