On iPhone 6s it appears Magnesium is to long to fit, just shows ...
I can affect this with the Dynamic Text Text Size setting in iOS Settings. If I make the text small enough, magnesium will fit. It does have to be on the lower end of the scale though.
I had the text size set 1 size bigger then default for a few other apps, set at default fits but is a little small for my eyes. If the text box was a little bit bigger it would fit.
Thanks Alan! I'll add that to the areas where text size makes things go haywire
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Don’t know when this was fixed but it is for the text size I am using