Glyph failover not working with FontLookup as both embedded or device?

I have an embedded font with a unicode range targeted to the latin base set:

unicodeRange = 'U+0020-U+00FF'

When my string includes arabic on a mac or kanji/han (chinese) on windows, the failover fails, as in I get the rectangles instead of a replaced device glyph.

It was my understanding that the FTE in player 10 swapped out failed glyphs for device glyphs per character. This appears to be working, but not for all cases.

On my mac, chinese device glyphs get inserted just fine in the case of this string: "車 and あります Kanji Test"

On windows this string fails by placing the rectangles in place of the chinese characters.

Another example shows arabic on a mac with the rectangles instead of device arabic glyphs: "Arabic Test  كيبورد للكتابة بال"

Thanks in advance for any insight.

NOTE:

Using player 10,0,32,18 on a mac and 10.0.42.34 on windows.

Using TLF version 4.0.0.10485