Since this is just mentioned in the comments, and I struggled with this problem for a long time, this solution:
Add the image to the Tab Bar Item and you will see the normal view of the tab bar on the specific View Controller where you changed it. When each Tab Bar Item received an image, you will also see a normal view in the Tab Bar Controller .
This is the only fix that worked for me after reinstalling Xcode and rebooting my mac, which did not solve the problem.
I would be grateful for other solutions, because I think that this was not always the case.
tammon
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