Not a bug, probably something that was not updated previously but:
“Back” doesn’t go up one folder level but exits the file browser
Its shift+back for go up one folder level 
The up arrow is shift… XD
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Oh I see. First time I ve realized it 
It is the same on my smartphone keyboard. To avoid confusion I think it would be better to use the same terminology as in the manual 
Or adding + like 
+Back
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Up arrow is used for shift to save space on the tiny help screen. It is pretty standard too. Lots of computer keyboards have up arrows printed on the shift buttons. Adding a + is a good idea.
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