Italicizing text via cmd-i (at least with the Roboto font) causes it to switch font styles to the wrong style. This is easier to explain in pictures:
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Roboto Light font
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cmd-i to italicize selection, notice the font dropdowns seem to think it is Light Italic (which would be correct) but the actual text looks thinner.
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Click on the text reveals it’s actually Thin Italic instead of Light Italic
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Oddly, this does the same thing in reverse too. If I unitalicize the Thin Italic text, it will display as Thin in the dropdowns, but actually be Light. It will also show as light when clicking off and reselecting the text.