Pressing the Tab key in Documents has no effect

This is my problem: When I press the Tab key in Documents (Version 7.1) on my iPad Air4 (iPadOS 15.5) no new Tab is created. Can this problem be solved?
Otherwise everything is fine with the Documents App.

Hello @Wkerner
Could you please record a videofile where you are reproducing the issue?

Hello, I am using the Documents App on my iPad 4.

Thank you for provided data. We have reproduced the issue and we added a bug to internal tracksystem (57969). We have started working on it.

Thank you for your efforts. I hope you are successful.