That’s totally understandable. I work in Latin, which has only been easy to type on a computer for a decade or so. I have Latin print works that mess up the fonts like this 
Here is a text and a screenshot of how it renders.
aeiouy
áéíóúý
àèìòùỳ
âêîôûŷ
āēīōūȳ
And a screenshot of how it renders:

So you can see that accents are fine, graves and circumflexes are fine except for y, and macrons are all off. I haven’t tested any other symbols.
FWIW I use Arabic and Chinese, too, and those render just fine as far as I can tell.
Thanks so much for responding so quickly!