Dashed Arc rendering an additional dash

i'm having trouble with a dashed arc.
i'm setting it to Fixed Count, End to End and Count = 5, but it's generating 6 dashes.
played around with the spacing and it seems like it behaves normally with 5 dashes when the spacing is below 0.5 (e.g. 0.499), but the second it gets to 0.5, or a value rounded to 0.5, it creates 6 dashes